You get comp drinks in Vegas if you're sitting at a $0.01 machine and betting one cent at a time on one line at a time...

I've never played a $500 machine, but if you're only playing one spin, you won't have enough time for the server to make the "rounds", take your order, go back to the bar and get your order, and walk it back over to you (unless maybe you're feeding the $500 into the dollar changer in $1 or $5 bills...).