pay for sports quotations some strangers, a free demo or a trial period would be needed, in other words being able to test the product before buying...
Even if you test the product, I doubt that you can earn 75% on this betting tips. Maybe a 1 month free trial for those who want to join these group is possible, but of course its the cost of OP which I also doubt is going to be free. We need a more details tips and the past experience of the OP regarding on the betting.