I was ready to agree with you because question in the OP wasn't so bad, but "So you have perfect user retention then?" -- seriously? Yeah, that's being demeaning. Maybe being demeaning is a good sales technique, I dunno, but that's definitely being a jerk.
But "Are you sure increasing your user retention isn't worth something to you?" or something like that maybe.
But "Are you sure increasing your user retention isn't worth something to you?" or something like that maybe.