More than 10 but I only buy them when I have a project at hand to work on.
Let me guess, you are the 100+ voter?
Less than 5
Between 5 and 10
More than 10
More than 100
More than 1000
After Goole launched private domains and I had too much time on my hands combined with wordze, and then Pat Phelan recently got me worked up about affiliate sites and more wordze research (grrr...), I think I'm hovering around the 50 mark.
And then there's the .mobi's (I saw that they have sold 375k of those now - God knows searchengineoptimis(z)ation.mobi might actually be worth something some day).
Oh and lest I forget the searchmarketingworld related portfolio (met Martin today, nice guy)
Someday I might actually get around to putting something on some of them