I'm member at ximmy for over a month now, and I already got my first payment of 30$ after just 20 days there, but only 3-4 active. I was struggling too with commenting, but when I started only reviewing I made more than 500 points in just 2 days. Now, after a few days break, I've decided to reach the second 1000 points by sunday, and I'm only 400 points short
Since they've limited to 50 comments (and reviews) per day, I'm able to earn about 200-250 points per day. Also, posting and getting voted is not a bad idea, since it isn't tough at all to upload 8 pictures per day, but I've noticed that the members are pretty selfish and they mostly vote for their friends. Having a network of few friends there (i vote yours you vote mine type) could be really useful, since if all of the 8 submissions reach the popular page, it could bring a 120 points almost effortless.
Another thing, I've received the payment within 24 hours since I requested it.
All I can say, it's a great site, I think they get the money from Google, but I'm not sure. As long as they pay me, I'm not interested. Also, I can't remember who mention that in this disscussion, but the tip to use Alexa top 500 websites for reviewing is great. Thanks