You know the concept. If not: http://gawker.com/cheap-bastard-ends-10-hours-of-starbucks-customers-pay-1625511330 Person in front of you pays for your shit like at Starbucks for example. Do you pay for the next person's or not? I probably wouldn't. I usually do a cheap order for 1. If the person behind me has 2-3 people, I get fucked over. So I'd be the one to ruin it for everyone.
When we go out to dinner with my wife's friends for a birthday, everyone splits the bill even at the end. I learned that shit once, and avoided those dinners like the plague after.
Oh god, have you ever gone out to dinner with someone who suggested "Credit Card Roulette". fuck that shit. Yeah, some people abuse the system, then they cheap out on the tip too even when you do split it evenly.
Someone suggested it a few times, one of my cousins, I'm always against it. Especially at expensive ass restaurants, you could potentially be out a few hundred just for a meal. You could also get it free, but that's not that encouraging.
Shit, I had a particular group of friends that would do this, and I'd always end up getting screwed when we'd all go out. So I started ordering the expensive shit. It's all worked out in my favor since.
Do it all the time. It's fun. The smart move is to slip the service person a $20 not to pull your credit card.