Believe me, I was surprised too. Very surprised. The stereotype of a famished author is pretty strong here :)

Thing is, without middle-men (distributors, bookshops), most of the revenue accrues to you directly. Long live e-commerce.

I can imagine that you have built some sort of strong followers community to promote your books? I mean how do readers find your books?

I write quite a lot of (commentary) articles on my blog and some other Czech portals reprint them. This helped me build up a community of readers.