one seller who has pissed me off seriously is blackwater's miniatures (username "blackwater_hollow").
they bought a crapload of ships from GW just to sell them for the double, triple, or whatevermultiple price than it was before.

examples:
-dauntlesses for 75 bucks.
-emperor for 155 bucks.
-a SINGLE falchion class escort for 35 bucks (wtf.)
-single (!) imperial plastic cruiser for 55 bucks.
-FW GK strike cruiser for 125 bucks. (holy shit. this is the most ridiculous

)
plain moneymaking off of other peoples misfortune.
people like that guy make me be sad that i cant punch people through the screen.
i am usually a very calm person, but this guy really, really makes me want to punch him in the face.