In its infancy, I was accumulating 10,000 pts/week (^) on OpenTable - but soon my "scheme" was discovered and I was banned! When it first started, lots of the staff at restaurants weren't totally accustomed to using the in-house software, so about 99% of reservations would be credited as a "show" versues a "no show". Found this out by mistake actually, but soon was making reservations at 5 1k restaurants a night all across the world....Great part about the certificates you receive from Opentable is that they are like cash in the participating properties, so I'd march down to my local bar with $600 in certs and buy 6 beers for my buddies - and with all the cash I'd get from my change, would be able to pay for my rent each month. Oversight on their part I suppose, but they soon figured me out and I stopped doing this about 2.5 years ago now.

Luckily, my new email address works and I'm playing fair now, so only 5,200 points currently.