After using "Cent sports .com" - a free ad based beting site, and taking 10 cents and generating around $48.00 in winnings, I finally understand where the catch to this site may be - the cashout. Google "cent sports" for the site, the editor will not allow me to post the link here.
It seems you have to request a cashout and are deemed worthy of a cashout only if the site determines if your "cashout score" is within an acceptable limit. I always seem to be below this limit, regardless of the amount I request to cashout.
The last cashout request I submitted, I was right on the limit of the cashout score, and requested a reason why I was not cashed out. When I returned to view my score, somehow, the scores were raised to push me below the cashout limit. (I was tied with someone at 43 - he was to be cashed out, then his score was raised to 53...).
Somthing doesn't seem right there, regardless of the notion that the site is "free."