I think a big part of the issue is the way you were booked.
I never met the B&G.
The wedding party is the who's who of the planet. I didn't know that either.
I don't know if you mentioned it, but were you actually picked/booked by the B&G or by some assistant or wedding planner?
My point is that they didn't seem to be emotionally invested in their wedding photos. When a typical B&G spend time choosing a photographer and meeting with them, there is usually some sort of emotional investment. They are paying you good money and they want good photos....so they will likely do what they can to make that happen.
In this case, even though it was a lot of money, it was probably chump change to them. There was little investment in you, and you were just another vendor to them.
If you could have set a meeting and talked to them, you surely would have been able to let them know how you work and what kind of cooperation you want/expect. If they has said that some guests won't want their picture taken, then at least you would have known that going in. Or if they said that they did want photos, you could have told them that it's their responsibility to ask their guests for permission etc.
Also, was there a wedding planner that you could have asked about this? I've worked a few weddings with pro wedding planners and they would be the go-to person for an issue like this. They may not be able to help, but they are probably in a better position to do something about it.
Not really a solution, but I keep thinking that if you charged them $200,000 and walked into that place like you were Annie Leibovitz, it might command enough respect that they would have little choice but to submit to being photographed. But you might actually have to be Annie Leibovitz to pull that off. :er: