I.E. Primadonnas i.e. not in the true spirit of metal.
No difference between the Castle and the Rocket Room, except the Castle is in a better location and has more metal decor and atmosphere.
I don't think it's a Primadonna attitude, I just think after while you want to present your band as best as possible & venues such as the castle don't allow that.
Don't get me wrong I have enjoyed a gig or 2 @ both venues... (Mostly while VERY inebriated of course
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Also both venues are great for live experience & bands just starting out (The Castle especially)