Lately, I've been looking into the TeeSpring / Tshirt fad exploding on the Internet. Although crowded, I think there's some additional upside left in the tshirt market.
After speaking with several accountants, I've determined that it's probably best to act via another sales platform (amazon, teespring, etc ...) to sell my designs as tax collections could be an issue / requirement.
This (tax collection) applies to other retail / tangible products (and soon digital...