For the uninitiated:
1. You design a tee-shirt
2. You set up a campaign
3. You promote your tees
4. When sales target is reached, tees are shipped, you get paid.
The trick? Viral trends.
A lot of the work I do online is really set up as a hobby. The majority of my work is devoted to "The Business" but, being a geek, a lot of my downtime is devoted to fooling around with different markets, niches, systems, products, ideas. TeeSpring falls into this category for me. But when I first got started, I made the mistake of treating it too much like a hobby. I chose a genre that interests me (we'll call it Star Wars, but that's not it) and designed my shirts and developed my entire platform and traffic system around what interests me. This is USUALLY the best way to go in any business. Do what you love, right? Passion shows. Knowledge does, too.
But what I've noticed - and it happens without fail all of the time - is when I follow a viral trend, or better, leap on it BEFORE it goes viral, shirt sales here overshadow regular sales by a phenomenal percentage. If you're into TeeSpring, I suggest using all of the various news and trend sources to help shape your current business model.