I agree there has been some recent tread crapping, and as long it is not a SCAM-- if you don't have anything good to say, why say it. This is buyer beware, and again, as long as it is not someone trying to sell a Canal St rep for $$$, it is the buyers responsibility to research what they are buying.
However, on the first come first serve. It depends. I have seen, and agree/support people who post "This is not a race to PM me first - I reserve the right to sell to who I believe is the best buyer". Furthermore, posting in the thread, PM sent, does not necessarily guarantee your place in line. I have purchased at least 4 watches by PMing but having never posted to the sales thread.
Given a choice during a sale between a Platinum Member with 1000 posts and a noob non-supporter who PM'd 10 seconds before.... Sorry, but to protect myself I would choose the Platinum guy.
Again, posting PM SENT in the thread does not mean someone else hasn't stealthily beat you to the draw. Finally, some even cross-post sales between RG and here.
So I agree on the thread crapping, but politely think the seller reserves the right to sell to whomever he/she wishes.
Thanks!
-Ronin