I can't say I'm entirely objective on this, since I do have a "for sale" texture set for the Vicki clothes pack donated to the store, however I'm afraid I don't understand your objection. If I design a killer plugin for a specific software package (PSP, PS, etc) does that mean I'm not allowed to sell it but doomed to give it away just because I didn't write the original program? Perhaps the next time you purchase a custom accessory for your car you should explain to the vendor that he should just give it to you because he didn't build the original vehicle :-)