Poasting old stuff crew checking in. Before the NC died I did exploration for income for about a year and a half. I ended up using two characters, one with a scout/scanner/tank tengu and the other with a golem for DPS. In July of last year I started keeping track of weekly income with the intent to make a graph at some point.
Here's the graph.
Income from exploration is highly variable, but I usually made a minimum of 100m/h. My best run was 400m/h averaged over 10 hours, and my worst was 40m/h averaged over 8 hours, which was a really impressive outlier.
Guristas are shit for exploration. I don't even like to think how much more isk I could have made doing angels or sansha instead.