I have a classical guitar that did manage to double in value within a very short period of time. Jon mentioned the Hondo ~ so he is the only other person that I know that has had one. I bought this one years ago for $50.00 as a Christmas present for my daughter. After a rather feeble attempt to learn to play guitar she decided that she didn't want a guitar after all. Well, as you might guess, I bought it from her and not wanting to admit that I only paid fifty bucks for it I gave her $100.00. I still own the guitar that .... let's see.. I have $150.00 invested along with a $25.00 case.
I have several other guitars, however, for years it was my favorite easy playing that never went into the case. Think I've played that Hondo classical more than any of my other guitars. My advice would be ~ if all else fails ~ "KEEP IT".