I tried my best to just 'observe' this thread, but as you can see, I've failed miserably.
First off, I don't haggle with artists on anything... not PSC's, AP's, prints, other commissions or even shipping & handling. Their price is their price - the value of their time, effort and everything else that goes into creating the art they would be making for me, so I don't think it's my place to say otherwise.
To the point of the original post, I don't have a problem with rip and flippers unless they are just flat out clueless about what they have, and even then, it's just a mild irritation.
The biggest issue I've seen is when only a few "big time" buyers buy huge chunks of a print run (meaning about 15% each to four or five sellers), leaving comparatively few for the collectors. I prefer to see the large orders broken up to accommodate several smaller orders.