I was a server/Cocktail guy at a catering hall in NYC for a year, and at least at that place, we never got any of an "umbrella" tip offered by the patron. The maitre'd pocketed that.
If a guest in our section tipped (we worked in 5 person teams - 5 tables per team), we would pool those tips and split them amongst the team. It lead to rampant hiding of tips amongst workers. Wedding guest tipped decently. Pretty much no one else would.
Oh, and at least where I was, we did receive a modest pay check paid by the shift. I believe it was $60 per shift.