> In other words, does it benefit me more if a bunch of people visit only the main page, or if they navigate the entire feature?

Only main page hits are counted.

> I'm just curious. I base my purchases primarily on how their prices have been fluctuating because I'm bad at guessing how popular a site will be due to content.

This is probably wise anyway. The current prices *already* indicate how popular the sites are (due to both content and exposure), so in effect this judgment is made for you already. So you basically just try to guess how the fluctuations will go.