the rake has to reach .40 cents before you are awarded points, so that that......Wow, I'm not sure. I don't go by the whole Bankroll Management ussually, so my thoughts are different. If it were me and I only had $25 to work with, I'd put it on two .25/.50 tables, when I doubled or maybe even trippled what I had put on the table to begin with I'd open another table and do it all over agian, until I was sitting at 4 tables.
With this though you have a really good chance of going broke if you don't catch cards or make the right plays. Plus your putting your entire bankroll at risk. Its hard with $25 because you have to be at a table to make enough money to get a rake, but low enough stakes that you don't want to go broke.