I will contribute my experiences.
I sponsored Star Ship by Badim for $450 plus $50 wire transfer fee and on it's best week sent me a few thousand UV per day extra than what I already had. Then it slowed to 1000 per day, 800, 500,than about 1.5 months later it sent me only 200 per day.
Before the game's traffic I had 700-1200 UV per day and was making $95 per month. The month before releasing it I had 16,530 UV total. In the month I release the game I had 38,788 UV. And only about 3,000 UV or less were from the 2 much, much smaller games I release that month.
The month I release the game I made about $185. After the first month the traffic from the game was only 10-20% what it was earlier. But the second month I ended up with 34,032 UV. Only a little less then when the game was new. That was because the game effectively spread the word about my site and my direct visits skyrocketed.
Over all I would say I made more than my money back and the game is still out there. Every once and a while it will get stumbled on another site or 2 and bring some nice hits for a few days. Yes it took a while to make the money back but it was worth it and a very educational experience.
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