I think a lot of people go through the same progression. I looked at chain mills, and it became evident that my little chainsaw wasn't going to cut it. By the time I looked at a new, powerful chainsaw, ripping chains, supports, etc., it was approaching the cost of low-end bandsaw mills. Then I looked at low-end bandsaw mills and could see how the features of the more expensive mills were attractive. Once I priced those having a guy come out occasionally didn't seem expensive at all. The guys who run mills around me don't seem to be getting rich.
If the room is 24x30x12, that's 1300 square feet of interior. That's an enormous amount of work for a chainsaw mill, probably a day's work for a bandsaw mill.