I'm one of those that keeps buying stuff too! I've already bought them their jewelry sets, but now I don't think it really goes with their dresses & shoes. I bought them all diamond circle necklaces with circle cz earings. Maybe I'll just give them anyways, and not expect them to wear for the wedding.
I've spent about $100 each on each BM, not including the thank you drag queen brunch I took them to, which wasn't cheap. But hey, like a previous poster said, we're saving so much on our DW's as it is, it's hard not to justify spending a little more on those that are important to you. My fi keeps asking me, "How much stuff do you intend to bring?".