Tips on Tips, please

[WallStTo5thSt]

I was in AC at the Taj yesterday and played (and won) a ten person 50 + 15 sit and go (I know the rake is absolutely awful but I was just playing for fun). Anyway, this was my first tournament money of any kind in a casino. The game took an hour to deal. Before I was paid a poker room employee came to collect some information. She asked for my drivers license and social security number. When I told her I was reluctant to give out my ssn she assured me it wasn't for the IRS but she did not know why the information was collected (I wouldn't have had a problem if it were for the IRS). Then she was very aggressive and pressured me to tip the dealer, and said the average tip for such a game is $40. I was obviously going to tip the dealer but is $40 a little much for such a game? My questions are:

1) Why do they collect social security numbers if they are not for tax purposes?

and

2) What is a typical tip for tournament play as a % of your winnings and/or time spent dealing?


Any help or guidlines are greatly appreciated!