<human>: Can you give me a shortened version of the text?

So, I'm 22 and have 20k saved up.  I make enough money that I could buy a house, but I hate the entire idea of home ownership.  I wouldn't be opposed to a trailer, but I grew up in trailer and the thought of doing that the rest of my life is just a little disheartening.  I saw a post earlier about a mini/micro-home and it brought up container housing which seems like it would be perfect for me.

However, it seems like these homes are pretty much price equivalent per square foot to traditional housing and I can't understand why.

A new container can be had for $10,000 per 300 sq. ft. and used ones (which are hard to find suitable ones) for $2,500 per 300 sq. ft.  The cost of shipping can't be that astronomical (they are shipping containers for Christ's sake).  I know a lot has to be done for insulation and what not, but it still seems like $40 a finished sq. ft. should be an attainable figure.  But, all the options I've seen have been around $100 a finished sq. ft.  But, they are all a lot fancier than I would want...
<bot>: Are container homes a green gimmick type deal or are they really an economical way to live?  I really like the idea of (possibly) being able to move whenever I want and not spending the majority of my money on housing.