I think this transaction, while perfectly ethical, will cause more paranoia in the hobby, which was already rife with it to begin with. The people who collect modern art, and also collect modern comics, have a distinct comparative advantage over the older collectors and dealers who do not know what's going on (or don't have a really good idea, of it) in the current comic industry, or the hobby. One reason why Felix dos so well selling modern art is that his stable of artists happen to be working on a good chunk of the hot modern books, and he's a trusted arbiter for his collector base that may not know as much about what is going on in the current comics hobby, etc.
But there's a lot of art out there for books that many in the hobby just have no clue about (right now), that younger collectors don't have the money yet to pay up for yet. You can buy that stuff up at pretty reasonable prices, and it is likely to go up when that cohort ages into the prime collecting age group.