My experience was not with user rapacity but with partner rapacity. I have always found good will towards users pays back 10 fold. Partners on the other hand are much trickier.
For me it was around what I thought was a carefully crafted contract. Long story by my partner seized all of the IP, than said "sue me". It was specifically prohibited in the contract, but I was not in a position at the time to spend a LOT of money fighting a team of lawyers.
Unfortunately what my team had made look easy was beyond the capabilities of the team he hired to replace us. So the product floundered.