I read an article today that said that its estimated that 37,000 same-sex couples are expected to marry in the next three years in California which could generate approx. $492 million in revenue to the state's businesses.  This in turn could generate $40 million in state taxes. 

I'll bet that some wedding related businesses  will originally balk at servicing gay couples, but the "all mighty dollar" will win them over.  We'll have to wait and see.