Hi GG
Generally poker is a slower process, with rake levels growing steadily. I suggest that you keep an eye on the rake levels over the first few months to see that the same Players continue to bring in rake, that will keep you satisfied that each of these Players are around for the long term.
The idea in rev share is to get the whale – the heavy Player that will surpass all expectations and more than make up for the smaller $20/month Players. Hang in there, it will come.
Stephen