"It's" is also a gender neutral possessive regardless of whatever a prescriptionist will tell you, it's way beyond common usage at this point...people denying it are just sticking their heads in the sand.
On topic: Servers are guaranteed federal minimum wage, *all* employees are, no exceptions. What it is, is that servers are paid less per hour but their tips count towards the minimum wage number, if a server does not receive enough tips to meet minimum wage for hours work, their employer must pay the difference(and they're screwing you if they don't).
Well I tip, I tend to tip a modest 10%, and have higher standards for what receives no tip(and I don't even feel slightly bad, do a better job). I've heard so many "boohoo I'm a server I make below minimum wage and rely on your tips to live" stories I wanna throw up every-time, you are guaranteed minimum wage, deal with it.
I also refuse to tip anyone who directly gets paid minimum or above, otherwise it's just completely illogical about why you tip some jobs and not others.
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