[jere]

Interesting, but I'm not sure I buy the "I'm unique" logic. It reminds me of "big-choosers" from the Toilet Paper Problem: http://gi.cebitec.uni-bielefeld.de/teaching/2007summer/jclub...

If everyone was a big-chooser, you get into a dangerous situation because rolls are being emptied at roughly the same rate.

Similarly, I am led to wonder what percentage of your users will be making their choice based solely on the coupon (i.e. least popular shirt at the moment). If it's a high percentage, then each shirt should approach 20% of sales. Hardly unique at all.

By the way, "Virgin" is an awesome design. Reminds me of Dali. I can't imagine opting for any of the other shirts in order to try to win a coupon.