Two Points:
1. Each time you lose $25, you have to win twice ($12.50 x 2 = $25) to make up for that one loss. Meaning that the wins must outnumber the losses by at least 3x to see a profit. This realization is a step in the right direction.
2. Avoid playing when you see the end of a winning cycle coming. For example, 7 C100 numbers have hit in NY so far, so this cycle is coming to an end.