I need opinions on the idea of a custom field where the user can input a bitcoin address on their profile and a QR will appear on their profile with the address under it to facilitate commerce between users. http://www.bitcointribe.com/
give me your thoughts guys. Thanks.
If you really want to facilitate commerce you might let users input a list of addresses and let them click used to have the top one deleted and the next one activated. This would let folks adhere to good privacy practices if they'd like that option. I would also suggest you use the bitcoin uri scheme which you can see at the site in my sig if you click on the buy button for any item and scan a qr code.