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(3)Open bar can mean lots of things: (a)self serve liquor, (b)unlimited drinks delivered by the bar tender or server. At Borgata (as far I know), it is (b), and eventually they may send you away.
At the Amphora Lounge, IME I've never been cut off by their bartenders (we're talking 4 or 5 vodka crans later). I hold my liquor pretty well and probably someone who looks really drunk might be turned away. Just my two cents.