I shot a choir concert inside a church last week and got some really good shots, even from a pew with my mini tripod. (I'm really starting to think the mini tripod and remote are the greatest thing ever.) But I shot for an hour and got maybe six great shots and a lot of crap. With more experience (I don't have much) I have no doubt you could get some good shots with a G6 at a wedding, maybe even get away with "covering" a wedding as the main photographer if you were friends with the bride and groom and they wanted to do it on the cheap and didn't mind autofocus targets on their noses the whole day, and were willing to cut you some slack. If you kept shooting all day, you'd be able to pull off some good shots of the ceremony and then do some set-up group shots that would be acceptable, especially if you had a couple remote strobes to play with and time to set up everything. You could order prints online, or even give the bride and groom a CD and let them worry about having prints made.
At our wedding, we had a photographer friend, a pastry chef friend, a dressmaker friend, a DJ friend, etc, all help us out and everything was cheap and more personal, We paid their costs, and it saved them the cost of buying us wedding presents. I generally design invites for my friends and pay for printing rather than buying them a present.
But if you're talking about starting a wedding photography business around a G6, I don't think it makes sense. People pay a premium for wedding photography, because a lot of equipment is requred, and you only have one chance to get it right, and there are critical moments that last a second or two, and if you don't get the shot, you're gonna have a lot of explaing to do. Every person involved in planning a wedding is completely wigged out and irrational, and at the actual wedding, they're wigged out, irrational, and drunk, and after the wedding, they're hung over, shellshocked, and broke. You don't want to take any chances.
Bb.