I just won a Gigi in the whiskey color on ebay for $300 i know that a good deal but i dont know why i feel so bad.
I don't either! Gigi is an amazing bag and you got it for a steal! I think you should keep it and enjoy!
I can only speak for myself-
but I know that when I feel bad about buying stuff it is usually because of an underlying factor. It is usually I know I dont need whatever I bought, I did not "have" the money but I bought it anyways, or sometimes its because I could not fight the urge not to buy it...
The only advice which i can offer you is enjoy your new bag. Whats done is done (plus its a BEAUTIFUL bag and you got it at a bargain!)
If it continues to bother you maybe you should go on a ban? I hope you feel better!