It is, Boca
I'm one of those with a relatively small list of followers. For my main Twitter account I have 361 followers, and I've gotten them all either from my email signature, forum signature, I guess, and then I noticed new followers when I've twitted something, probably because of a keyword trickering somebody.
So again, activity works. You write, some come.
You can get more followers by following others and hope, they'll follow back automatically. I don't like that type of followers. I prefer to find somebody who wants to connect with me, because of what I write, and not just because I've chosen to follow them.
After all, how responsive can a follower be, if he already follows thousands of others?
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