Half of B2B Buyers Would Switch Over One Unanswered Relationship

McKinsey’s B2B Pulse 2024 surveyed roughly 4,000 decision makers across 34 sectors and 13 countries. One finding should stop any consultant or firm owner in their tracks:

51% would find an alternative supplier if they were not connected to the right person for help.

Not if the work was bad. Not if the price was wrong. If they could not reach the right person. Half your client base is one unanswered relationship away from looking elsewhere, and they will not tell you they are looking.

The literature on this argues with itself, and you should know both sides

The famous claim in retention is Reichheld and Sasser, “Zero Defections,” Harvard Business Review, September 1990: a 5% lift in retention grows profit substantially. Two corrections to the version in circulation. The real range is 25% to 85%, not 25% to 95% — the upper bound everybody quotes exists in no primary source. And Frederick Reichheld is a Bain fellow at a firm that sells loyalty consulting.

Then there is the paper almost nobody in this business cites. Reinartz and Kumar, “The Mismanagement of Customer Loyalty,” HBR, July 2002, went looking for the loyalty-to-profit link in four companies’ transaction data and found it weak. Their conclusion was that about half of loyal customers barely generate a profit.

I am giving you both because you are in the business of evaluating other people’s reasoning for a living, and an argument that only cites the half that agrees with it is one you would take apart in a client meeting.

What survives both papers is narrower and still worth acting on: retention is cheap to attempt, and the attempt is the thing almost nobody makes.

Four numbers from the draft that did not survive

This article started life full of consulting statistics. Here is what happened to them.

“63% of consultants cite networking and referrals as their top marketing channel.” The citation link is dead, and the publisher’s own survey refutes it — networking at 14% plus referrals at 8% is 22%, not 63%.

“60% of consultants’ business comes from referrals.” Close, but backwards. The accurate statement is that 57% of consultants get at least 60% of their business from referrals, which is a distribution, not an average. And the source is a self-selected list survey, not research.

“Average consulting client lifetime value of $136,959.” That is a marketing agency’s estimate drawn from its own client base. Usable only if you say so in the sentence, and rounded to roughly $137,000, because six significant figures on an estimate is a tell.

“CustomerGauge independently corroborates the $385,000 figure.” It does not, and this is the one that bothered me. Seven of seven of CustomerGauge’s industry figures match the other vendor’s, one of them exactly. It is the same model cited twice under two different names, presented as independent confirmation. That is not a sourcing error. That is someone hoping you would not check.

So I have no lifetime-value figure to give you, and neither does anybody else. You know what your average engagement is worth better than any benchmark does.

What you are actually competing against

Your clients are not ignoring you. They are drowning.

The Microsoft Work Trend Index 2025 is built on anonymized Microsoft 365 telemetry — observed behavior, not self-reported habits — alongside 31,000 knowledge workers in 31 markets. The average worker receives 117 emails a day, most skimmed in under 60 seconds. Microsoft sells the cure for exactly this, so weigh it accordingly; they have no stake in paper.

The line from that study I find most useful is the one about the direction things are moving:

“Mass emails with 20+ recipients are up 7% in the past year, while one-on-one threads are on the decline (-5%).”

Business communication is measurably becoming less personal, right now, at a rate somebody can count. Every one of those 20-plus-recipient emails teaches your client a little more firmly that nothing arriving in their inbox was written to them. Your genuinely personal email pays for that lesson too.

And Pew Research Center, July 2025 — 9,397 US adults, margin of error ±1.3, no commercial interest of any kind — found 63% get scam emails at least weekly and 73% have experienced an online scam. The inbox is a channel people have been trained to approach with suspicion. Nobody has ever been trained to distrust an envelope.

The reason you have not sent one

Two clean psychology papers, neither funded by anybody with a stake in the answer.

Kumar and Epley (Psychological Science, 2018) had people write genuine letters of appreciation and predict the reaction. Writers predicted recipient positivity at 3.11; recipients reported 4.12. Writers predicted awkwardness at 2.95; recipients reported 1.95. Both errors point the same way, and both are reasons not to send.

Liu, Rim, Min and Min (Journal of Personality and Social Psychology, 2023) — pre-registered and independently replicated at n=742 — found a robust underestimation of how much people appreciate being reached out to, and that the effect is magnified between people who are socially distant rather than close.

That is your relationship with a client eighteen months after the engagement closed. The exact gap where you feel most awkward reaching out is the gap where reaching out lands hardest.

What to actually do

Send to the clients whose engagements closed, and to the people who refer you work. Not a newsletter. A card, signed by you, with one specific line in it about the project.

Federal survey data says mail to someone with a prior business relationship is read at 64% against 36% for strangers (USPS Household Mail Survey FY2025). That list is usually short in a consulting practice, which makes it cheap and makes hand-signing trivial.

Half of B2B buyers would switch over not being connected to the right person. A card is the least expensive way in existence to be a person rather than a vendor.