[OutOfCrown]

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Freebie limo drive from the airport picked up by poker site or business (paid for by marketing for tournament, or business associate for business trip). No cost, water/snacks etc. in back - trip again to Bellagio or Caesars. What's a reasonable tip? $20, or am I a cheap-azz?

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I can answer one of these, as I am good friends with an owner of a fairly large limo company.

If it's a business trip, with an invoice sent back to the business (and probably an ongoing contract relationship), such that you aren't the one paying for the ride, then no tip to the driver is expected. An automatic tip for the driver is included in the invoice sent back to the business.

Sometimes the driver will imply otherwise ("hey, what's wrong, didn't you like my service?"). If the driver hits you up for a tip, say "isn't the tip already included in the invoice?" and if he says no, give him $20 then tell him you will be calling the company to verify his story. He'll be fired that afternoon. The $20 keeps your karma intact for ruining his job.

You can, of course, tip for service above and beyond, but just opening doors, having water, etc. is expected and not above and beyond.

I'm not sure about what the right protocol is though when Caesar's just sends their limo to pick you up at the airport. My answer above is when you are visiting a business and they send a contract limo service to pick you up. I imagine that the driver working for Caesar's just gets some "adequate" hourly wage and probably would appreciate a decent tip.