They sure are fugly, but attractiveness isn't everything. The movable AC units with two tubes are inefficient and not very effective compared to a window unit. The movable AC units with single tube are so inefficient and so ineffective that they are basically a complete waste of time and money--I basically had to have mine blowing directly on me and the electricity cost was mind-blowing.
I do like the split units, but I got a quote for that and it was over $6,000 in my 1-story house. My friend with his 3-story house required a ton more work and his quote was $12,000. You can imagine that a lot more people can afford $300 for a window unit, and they can hide it away in the garage when its not hot.