OK, here is his initial response:
I (speaking for Warp) don't mind if someone does a commission sketch at a convention. I don't mind if, in the course of an artist's work for Warp on EQ, they want to unload some of their original art pages. I do mind, however, if someone gives the impression that they are in the business of doing EQ art for others.
I do like the notion of freedom of expression with respect to fan art and fiction. I do not like the notion of someone using EQ for personal gain in such a manner that it appears we've given permission (explicit or implicit).
So, in a nutshell, WaRP does not give permission to offer paid commissions, or sell fan artwork, of ElfQuest copyrighted material for pay. If someone feels they have a situation which may warrant an exception, then you can PM Richard over at the elfquest.com forums, or send him an email (I believe rpini_at_elfquest.com still works).
In general we have no qualms with posting sales, or offering paid commissions for, original characters. Whether or not any of your original characters run a risk of infringing on the ElfQuest copyright is not a gray area we are going to impose ourselves into.