I just had the best idea ever! Ok but this may only work if you're willing to compromise.
If you have 6 tables or less (or lots of bridal party people) get them to set up the centerpieces during the cocktail hour. Get them to bring the centerpiece stuff to the ceremony (stashed in bags in the corner, use the OOT tote bags for camouflage) and then after the ceremony get them to run over to the reception area to set them up. If they do it AFTER the venue is set up but BEFORE the guests get there you should able to pull it off without paying super REDICULOUS fees.
This won't work for everyone but if your venues are really close together and the centerpieces are simple this should help. Like using Tucan Beach and Tucan Terrace.
Ex. Vase and fake flower bouquet per table with a few votives (will take under 5 minutes to set out). Don't light candles until lights go down.
Ex. Chair sashes, 10 per table, simple bow. (3-5 minutes. 2 minutes if they move their butts).
Im not talking about strolling around at a saunter here. I'm talking about being wedding party NINJAS. Rush over, whip em out, get back to the party. Are they REALLY going to stop you? Pull everything off the tables?
Are you REALLY going to let them completely get away with highway robbery? I say fight back for the dignity of your wallet!
*Note: this really depends on the level of fanciness of your wedding. I'm pretty sure mine will just be a week long drunk fest so I'm not worried about pulling out a few ninja moves. Everyone will be too hammered to notice anyway.