I think you made a slight mistake on the pool, you would have created the pool in such a way that one can select multiple options, for example, many of us who are real gamblers are here to find new gambling opportunities so as to make more money from it probably.
And also at the same time providing advertisement for the different casinos through our signatures.

The above is for me though, I don't know about other users, but I am always on the lookout for opportunities that could bring in some guaranteed winnings for me,, could be through bonus or some sure bets, doesn't really matter as long as I make money.