Oh, my! I think you are being way too hard on your quilt. My tendency is to be perfectionistic too, but there are lots of people who would *love* that quilt just the way it is!
I wouldn't do an auction, though, if you can do a raffle for $1 per ticket (assuming raffles are legal in your state). Especially in these tough economic times, raffles are likely to raise more money. Raffles also give everyone a chance to take home a quilt; not everyone can afford to bid on a quilt.