Why are Las Vegas cabbies so weird about tips?

[NajdorfDefense]

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Do the pit dealers perfer their tips as bets or as a $$ tip as you leave the table?

I mostly play craps when playing in the pit and generally tip as bets when playing and then throw the dealers any singles or fives I get back after being "colored up".

I generally tip $5.00 an hour, more when winning

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$25 50-50 yo bet after each hot shooter on the come-out roll. Occasional 50-50 hardways if I'm rolling or the same number keeps hitting repeatedly.