I discussed this with nabi's marketing director. I represented your position to see where it would go. This is what he came up with:

The value of items strongly go down if in fact they become single use when you restrict the market according to your proposal.
If you can't sell your vampire force, it's only useful if you're wearing it. Leading you to have no reason to own items you aren't wearing on your character as you have no form of selling it.
Consequence: Marketing goes down, nabi makes less profit from people who currently buy things with the fact in mind that they can re-sell them.
The hundreds upon thousands of micro transactions that occur, which drive our economy forward, typically occur between small time users and few really high TC owning people.
Eliminate that and what the fuck is our economy based off of? 12 year olds hoping to wear the color BLACK?
If your targeting demographic is 11-19 year olds. Most of them without cash or a job, is it smart to base the entirety of your economy off Credit Card purchases? Of which are 100% cosmetic, and yield 0 chance of return as they can't be sold, exchanged. Particularly the free market animates people to invest into items because they know they can get some value back into their possession once they don't like them anymore.
Additionally: would there even be a Texture Art market? Probably not, since it depends on a free economy.
As a company, do you want to be remember after 7 years, to just say "Fuck you" to the people who have invested into your game like Toast, by making every item they're not wearing literally useless?