Okay, my justification for the above:
HBK - Multiple well-documented refusals to drop title belts. Sometimes unprofessional in the ring (look at Montresor's avatar!).
HTM - Threatened to quit the WWF while still IC champion rather than drop the IC title to Randy Savage in 1988. I remember hearing something similar from when he was in WCW.
Warrior - If the DVD is to be believed, held Vince up for money before the Summerslam 91 main event.
HHH - The Booker T incident, for starters.
Hogan - OK, thinking about it, I'll take him off, because the guys who've brought him in are more at fault for giving him complete creative control in the first place.