I suggest you to join which less members with amount, so that we can more amount with less investment.
or try this
join more pools with less amount and try to bilud good four teams so that you get double of your investment.
I think they are creating teams for larger pools, to cover if the seats are not filled for a particular league.
and its all about luck and selecting your based on your cricket knowledge, there is no strategy to earn good money, its all depend on luck.