Thank you so much, I'm really happy to know it looks great to you.

I guess the key difference between Printul and the big players is that they are (or will be, in the case of Flipboard) monetizing via ads, while I monetize selling the apps themselves. I don't need (nor want) this to grow into a multi million user service, it can be profitable just with selling around 100 copies a month (which I guess it's a reasonable number).