Ok after reading the make the tee's more expensive blog I started to think about real ways that would improve threadless (bumping up the price is moronic, it is only justifable if the production costs have gone up).
So my suggestions are to number the shirts.
I like the fact that I've bought a tee the first time it came out and i like the idea of it saying first edition on it, then the reprints would each have a number for their addition.
I'd like to see limited runs of threadless tees, threadless prints 4000 of each design then more if its re printed. One of the big attractions of threadless is that its unique and not everyone has them so it would be cool to be able to buy a tee that was from a run of 200, 500 or will only be printed once.