I considered setting up an MT site myself just to have one, but I'm not sure I have enough to say to make people go to a website just to read my stuff all by itself. I get relatively few comments on my LJ postings, so I don't know how many people are actually reading it. I could spend a lot of effort on such a site and only get the chirping cricket effect. Some people like mcgroarty are popular enough to do that, and technical enough to throw in an RSS feed to their LJ to cover those they leave behind, but I doubt I need to look into that for mzself. I had a blogger up for about two years with no readers as far as I could tell.
Now that doesn't mean I will not be reading the other ones - I just don't have enough material to put one up of my own. LJ will do for me.