As my post said, this host offers servers with that engine and without. I would simply ask him to switch me to a server that had it, and he would still have me as a customer. How does that represent a "customer churn."?if I were one of their customers and decided I wanted to try innoDB.
If I have twenty servers and I arrange the systems on them and price the sales on them to maximize the profit that I make on each server, I simply cannot imagine how that represents a "poor business strategy." I am willing to assume that these multi-million dollar-per-year companies do actual studies, and do not simply make greedy guesses at the prices they charge or in deciding what services they will offer.