In response to Mena's post I wanted to give a summary of how I use MT.

Currently I run 6 blogs on movable type... I run two personal blogs, including this one, a design blog with free templates, a testing blog that allows me to test out templates and designs, a website tracking law school admissions data, and I've also set up a blog for my brother. Although I'm the author for five of the six blogs, I do use pseudonyms for some of the blogs. Also, I'm planning to set up a site specifically aimed at law students next year. None of the sites are for profit. None of them have ever generated revenue.

I'd like to be able to run about 10 blogs off my site. Currently I pay $150 a year in webhosting fees. Installing Movable Type 3.0 would double my costs for running the websites, and at this time that just seems too steep for something that is a hobby, especially as some of the sites, notably the design and law school site, are essentially services provided free by me to other people. Realistically, I would be unlikely to pay more than $35 to maintain my current level of service, and unless prices fell within that range I'm unlikely to upgrade. If it was a one-time only deal with guaranteed free upgrades, I might be willing to pay a little more, say $60.