Where would one suggest people protest if not in front of the theaters? Perhaps one would assume most of "them" attending could care less is because they don't realize they are seeing a non-Equity/non-union production. Ergo, the need for a demonstration/picketing/protest that the attending audience can see.
There are still many cities with long and strong union ties. Cities where other unions stand shoulder to shoulder as a sign of support. Does it effect attendance? Probably not to someone with a ticket already in hand. But with some it does. Some will never cross a line. Especially when a union has been part of a city's heritage and part of a family tradition. Yes, the protest can make a difference.
Now, what other way would one suggest they go about it?
Rest in peace, Iflitifloat.