Which affiliate marketing networks can I make the most money from?

I have been using Clickbank for affiliate marketing products for the past 4 months and I just made the payout last week since you have to have 5 different transactions to get your first payout. I only do affiliate marketing part-time on 3 blogs and 1 niche website, but I would love to eventually do it as a full-time job and make more than $75 a month to do so. For people who have experience with different affiliate marketing networks, which one do you see the most sales and income from?