This thread has been excellent in demonstrating all the efforts and pitifalls making cloth to sell, to be a 'merchant'. Comparing that to making conforming cloth for your own use it's EASY. You don't have to nervously check everything again and again for pokethru, you don't need to make hundreds of morphs you don't need don't neeed jmcs at all! Most  merchants work days if not weeks on their products and the artistic spontanity get lost in the process. Not to speak of that collecting cloth done by others and render out is more like an activity for little girls, and has nothing to do with being an artist.