Weddingbee boards

i am considering a "destination" wedding in st. augustine, most of my guests are from south carolina, so it is like a 6 hour drive, not a huge deal, but enough to consider it destination. the wedding itself is also slightly under 50 guests and my sc guests are all relatives, and i found the most amazing venue, an enormous beach house that sleeps 22! the cost includes a 4 night stay, so i want to invite my bridal party and their respective spouses to stay in the house. my dilemma is this, it is pricey, but is it really awful to ask those staying in the house to pitch in $100 per couple? otherwise they would be staying in hotels and be spending way more than that, and i am not asking them to pitch in any other way, i am having the event catered, cake done professionally, etc. honestly, my bridal party isn't doing anything at all, they all live in other states, and i will only be seeing them right before the wedding. i understand that it almost sounds like i am asking for compensation for easy bridal party duties, that is not it at all, i just don't think i need to give everyone a free 4 day vacation on my parents' dime. it is hard to convey it, but i really am not asking for a handout, just trying to take a little pressure off.