I'll remind people that the issue with bakeries isn't having to bake a special kind of cake for gays, it's not wanting a cake you'd bake for anyone to be bought by people you find icky who will serve that cake at a same-sex wedding that your church doesn't recognize as a valid ceremony.
The issue for bakers is usually not the cake and to whom it will be served, it's the decorations on the cake. They'll sell a standard unadorned cake to anyone, but some don't want to adorn it with a same-sex couple in wedding garb.