I think if they choose something that is expensive & you know this but you insist on it then you should cover the costs...like staying somewhere flash or getting suits made.

Usually the bridesmaids & groomsmen will pay to hire the suits & buy their dresses. Well most I know, unless you are going over the top then you may want to cover half or so on. My bridesmaids bought their dresses (they will get plenty of use out of them), but I paid for hair, accomadation the night before, and they got earings & braclet to keep as a gift from me.

I would say something if it's getting way to exp. But if they are 2 lawyers earning over that amount, perhaps they are just into flash stuff & are not stopping to think others are not as well off IYKWIM.