to an extent it depends on how well off the parents are. If they genuinely need the money - then fine. But otherwise what are they earning for? my money is for my kids, i am not going to be buried with it.

....and thus you teach your kids what? That they can sponge of dad anytime the going gets tough?
How well off the parents are is totally irrelevent, period!
Youngsters need to learn money doesn't grow on trees and when they enter the 'real' world that's how it's gonna be.
When you die what will your kids do then? Starve? suffocate cos daddy aint around to wipe their a*se?
Sorry mate, i just think you are so wrong on this that its insulting."Spoilt brats" is the terms i'd use for such kids and "irresponsible" is the term i'd use for any parent that lets their offspring get away with it....especially when they are fully grown and in their 20s.
Andy; i sympathise and empathise mate. My 2 step sons are only 16 and we're trying to teach them that they have to work/fend for themselves. We don't charge board, cos they only do paper rounds, but the time will certaily come when we do, if they want to take advantage of the food, shelter, laundry etc that we offer them.
You've done your best by them, but their mother IS being irresponsible (as said by another poster) and unfair. The thing is she will/may use the "if they were your kids you wouldn't do that" line which is totally unfair....but typically woman-like.
Good luck buddy.