Who told you that investing in gambling site is failure? So far i have invested in 3 or more and all of them profiting. There is even a chart to show the daily wages, daily amount waged and daily profit. Although the profit can be red at days but in the long run, it is in healthy green.
For me, if you are really addicted into gambling better that you are going to do it while you are earning. And it is going to be better if you are going to choose both of it, which is to gamble and to invest. As you are still gambling make sure that you have investments and investing to gambling sites are really profitable at all if you are just going to analyze it.