Since three people have now asked, I'll post the spin off. Definitely bad taste to ask people to pay to attend your wedding -- it's not a concert.
BUT!!! If a guest offers to pay to attend your wedding with no provocation, is it also in bad taste to accept?
Let's add some background: A few of us have had friends offer to pay to come to our wedding. I already have a guest list that I plan to stick to, and if I end up having space, perhaps I'll invite my buddy, but no promises. So I'll have enough to pay for the people I *want* there. So this is asking your thoughts as to how to respond to someone offering to pay to come, someone who you don't absolutely need to have there (like my current guest list), but who you wouldn't mind being there (buddies I only ocassionally hang out with.)