Hello. Guild Master of Return present.
As far as im concerned, you joined a Return - UBRS - PuG. Which means Return sets the loot-rules. And if the leading representative of return finds it reasonable to let everybody need on a lucrative item. I do not see a problem with this? (e.g. Traveler's Backpack.) The fact that he went on to post the Beast deck on the auction house has NOTHING to do with this...(if anything..a fraction of eight.) Afterall the guy in question won the item fair and square. I suggest you stop being so salty and stop with your puny contribution to this forum.
If you are looking people for your "return ubrs pug" you need post your loot-rules while searching people there, for example "lfm ubrs (ace reserved)" and i highly doubt that was the case here because otherwhise this priest wouldn't have joined this run. And the travelers backpack example was just plain bad, people need those items because its a new server and almost everyone really needs those because they dont have better ones.
A warrior doesnt need beast deck because its a bis trinket for healers and useless with warriors / dps classes. Just bad behaviour and excuses for being a ninja in my opinion.