Bill MacKenty's capcha doesn't show up on my browser, so here's my comment to this post (which, quite frankly, is probably not worth your time, but I've already written the stupid comment, so here it is):
I don't agree with the first few points.
If, for some reason, you want to blog for six months, why not? It isn't like you're going to be unpleasantly surprised by the fact that, as you anticipated, you decide to stop blogging. What are we comparing this to? If you're talking about other types of amateur publishing or broadcast, the fact that you can try blogging out at no cost and stop if you feel like it is a great advantage, compared to, say, publishing a magazine or getting a show on a local public radio affiliate or cable access channel.
Unless you're applying a super-strict definition of what a "link post" is, the massive popularity of blogs like Boing Boing and good old Slashdot (to name a few) would seem to refute your second bit of advice.