@HerraBRE even if there is no moral obligation, you still may feel a need to listen to the paying users. After all, what if they threaten to pull their monthly funding?

Same for the follow-up question: It might be, that those who pay more, get listened to more.

There are probably several stacks of game theory lectures on this somewhere: Is it worth to slightly inconvenience 500 1$-Users in order to please the one 500$-User. The risk that they all go is slimmer than that for the 1.