Only if it matters to you as a person.
If so, you should behave, professionally, as you would personally. Otherwise it is, per se, hypocrisy.
When you endorse and profess complicity with statements such as, "I don't think it matters if I think it's wrong or right," or "setting aside your personal beliefs," you have established that you do have an opinion or ethical standard that is contrary to the subject matter but that you have on overriding force causing you to suppress your own standards. In this case, it is money and that is what many find offensive.
So what is it, does it matter or not?
P.S. Don't presume to know what my position is on this subject matter because it is irrelevant, has not been stated and likely not what you may have assumed.
Ok let me clairfy for folks....
I am not against same sex marriage, period.
My only concern was if there were any specific new traditions associated with a same sex marriage that I need to be aware of. DJ Fuzzy answered that question beutifully on the first page if anyone would care to review it.
No, it does not turn my stomach to see two woman kissing or other things associated with lesbianism.
No, it does not bother me to see two men kissing. Just don't ask me to kiss a guy. Wont do it.
On a business level my personal values don't matter as I've stated before. If I want to be in business as a business for profit I can not discriminate on who I serve. If they have the green I'm willing to work. I don't care if it's a Jewish event, Baptist event, non-denomination, gay, purple, green, blue... as long as the money is green and they are pleasant to work with I'm there.