There's differing consensus in the different forums w/r/t sharing discounts, and the anti- has prevailed on this board. A couple of points to keep in mind: The vendors usually don't like it. Early in the frequent traveler game that has evolved to FlyerTalk*, there was a guy who researched and publicized the discount codes provided by American Airlines to preferred organizations. AA squelched him. The meeting & travel planners and the like at the organizations that contract for the codes very definitely believe "the more the merrier". But the debate goes on, at least in this forum.

* Mr. Petersen largely perfected the game by (rarely publicly saying ill of and...) persuading the vendors that if they've set the bar right with their discounts and promos, the more business that is generated, the better.