I agree with Jim
I dont see then as an "Investment" as such, but i do think you can get a really good one and use it for a few years, not putting to much milage on it. Then sell it for what you paid.
As for buying one and waiting for it to go UP in money, i think you would be VERY lucky for that to happen, and if it did, then not by very much at all..............Maybe 1k