To be honest, I had absolutely no idea how the shirts would sell so I didn't make any promises or mention a specific number up front. At the time of the initial email (a few hours in) I had sold a handful of shirts.

I ended up giving him $25 and a free shirt, which he gladly accepted. After all, he did only spend a few minutes uploading a photo and adding the link, so for his effort, I think it was plenty. Like I said before, it's hard to quantify how many sales came as a result of his effort. About 8 hours after I started marketing is when things really picked up and went viral, which I think had little to do with the event itself and more to do with so many "shares". The events were a good launchpad, however. FWIW, my profits for this project (after costs of shirts, shipping, paypal fees etc) were in the low 4-figure range over a couple days. Some were estimating I made upwards of $100,000, which is obviously nowhere near accurate. I am ecstatic with how things turned out, considering it only took a few hours to build and I am now covered for 5 months rent (yea, cheap college apartment).