So I asked each BM separately about their budget for a dress. The general answer I got was "I don't care. I trust your judgment." I tried to probe further to get a better response or at least an idea of what an upper limit might be but they just said they don't care.
I can't really say too much about this though in the negative because it's exactly the same response I've ever given to a bride when asked a budget for a BM dress lol. I realize now that's it kind of a confusing answer and not really helpful on the receiving end.
Do I do what they say and use my judgment? I think of myself pretty reasonable when it comes to this stuff and I guess I would use how much I've spent on BM dresses in the past to kind of gauge this...but it would've helped to have any sort of more clearly stated answer, you know?