There is a saturation of textures on the market, I think partly because with all the good quality texture resource packs out there it's gotten a lot easier to make them and more hobbyist are jumping into the marketplace. Clothing on the other hand, is a much more technical endeavour, not only do you have to master your modeling and UV mapping app you have to jump through a lot of purely technical hoops with the cr2, the joint parameters the ERC morphs etc...and for hobbyists (which is how we all start I guess) that becomes extremely time consuming. If you do this part time as I do it can take 2-3 months to pump out a clothing pack, that's if you don't get so frustrated you give up on it midwiay. This is probably why there are 10 character pack to one clothing pack.

Dominique Digital Cats Media