While I generally aim for three releases a year (which could be considered too much by some), I try to keep things fresh by having each release sounding different than the last. I cycle between floaty ambient (borderline new age), darker ambient, and sprinkle with orchestral stuff in a film soundtrack vein. In doing so, I'm sure there's listeners who only enjoy some releases, but I figure I capture a larger audience in the process.
As an artist to who gives away everything, I think it's hard to find a following from listeners who generally download, listen once, and forget about it. I'm sure 75% of my downloads fall into that category. This is the down-side everyone's talking about... about losing the magic of getting your hands on a new release... there's no commitment to the music. But I do have repeat contact from a number of visitors with their comments, and interest in upcoming releases, so I must be doing something right.
Seren's comment on having listeners recoil from personal contact seems bizarre to me. I've seen the opposite. Perhaps since I give my stuff away, I'm more approachable since I'm not seen as "a real artist". I'm just some guy who makes music.