But "Are you sure increasing your user retention isn't worth something to you?" or something like that maybe.
"So you have perfect user retention then?" is a better question because you know for a fact that they can't have 100% user retention and they know that as well so it forces further dialogue.
There are definitely better examples I could come up with, but now I'm stuck with this one because it's what I quickly typed out earlier.
Anecdotally, it feels as though it leans on a lot on the targets level of politeness and decorum to want to continue the conversation. I favour polite but abrupt and seemingly heartless conversation enders for this reason.
"Hello sir, would you like to help a child keep eating for $2 a month?" "No, thank you!"
Back to this specific case, I guess the trick is to deliver your question almost rhetorically with both parties knowing that it leaves an answer that is common knowledge. Kinda like safe small talk about the weather.
Keeps the conversation going buying time for another hook to be deployed.
It's not sarcastic, it's serious and that's the point.
Obviously they don't have 100% retention, so this question might open them up to talk about their retention instead of saying "no, it's fine like it is".
It doesn't matter how good your retention currently is, if the product can boost it even by a couple of percent it would probably pay for itself many times over.
I think you could make the argument that saying "no, we don't need it" before even trying to understand the value prop is just as demeaning.