I loved this article, but after thinking about it for a bit I realize that there is an argument for going free. Two pretty strong ones, in fact. 1) If you want to get acquired - and we're talking about a big acquisition here - it would do to go free so you manage to score a big-enough user base to get noticed. And so the bigger company is interested in acquiring you not only for your technology, but also for your use…
Going free also makes sense if you want total market dominance. In which case, free is really the only way to go. No it's not. The other way is to make the best damn product in the market. I hate to give cliched examples, but since we are talking market dominance, see Windows, Adsense and iPod.
At one point in all these product's lives they were lousier and smaller as compared to their competitors. But they won out because the low barrier to adoption (read: free) drove usage, and from usage, more improvements.