[thejeff]

It definitely does not. (Even if it did, unless it also took into account initial placement it would pretty much be a wash in any but the smallest games.)

Observer bias as rdonj said. You're also most likely searching more completely in the paths you're strongest in. It's really only fair to compare income in paths you've searched completely ... and subtract any capital income.

I've definitely had very bad luck with national path sites in some games. One MP as Man, I think I'd found maybe an extra 2 Air gem income, but had found Necromancers and was swimming in Death gems. MA Man as a death power, not where I was planning to go... Then I got stomped by Ermor.

In general, I think I tend to find more Nature and Death than others but it varies.