That's pretty variable - the person I knew who lived in a mobile home had one that he'd inherited from his mother. I think the lot rent was not too far from what I'd previously been paying for a pretty nice apartment which really kind of sucks since all he was getting for that was a cement slab with some utility hookups.
The other problem he had was that because he owned the mobile home, to get out of the whole situation he had to either find someone to buy it (and take over the space or move it) or he had to get it out of the space himself. The residual value of a 20+ year old mobile home is really pretty low if it hasn't been kept up well, but I think he eventually sold it off to someone for a small amount of money just to avoid having to fix it up enough to be moved.
