If nobody else can skin it,  why would he not get it?  sure it sells for a crap load, but if it was a pug and nobody had it then he should get to have it.  If someone else was a tailor, on DM N and the purple plans drop, would he be wrong to get them?  personally i wouldnt have been upset.  I cant do anything with it but sell it.  Its one of the reasons why he ran it.  If you take the logic out to the end, then everything shoud be NEED rolled, even set peices that are BOE.  Who cares if someone is the only priest and the devout grips drop, everyone gets to roll, cause they are currently going for 200g.  I think most people would say, give them to the preist.  so why get on ohnez for mastering the skinning and going on the run in the first place.  If there where multiple people with skining, yes he should have to roll to get to see who gets the opportunity to skin the beast, but if he is the only one who can, i think he is justified to do it.  Otherwise he could just tell people to pound sand and skin it themselves.  and nobody would get it.