Can you post pictures and give a full rundown of what's been done to it? Is it a new or old style?
I rebuild power hammers on the side, and can say that the rebuilt little giant market is tough. In the last year I have seen "rebuilt" little giant 50's sell from 4 to 7,500 USD. These rebuilds ranged from a slap of paint to what was advertised as a full rebuild. I underline advertised because their simple machines and can operate in a wide range of tolerances, and it's subjective if a part needs to be fixed, or is fine as is. There are also upgrades that can be done during the rebuild to increase the longevity and efficiency of the machine that may or may not be present in a rebuild. Last, you have optional equipment that effects price, like spring guards or brakes.
Hope that helps - Morgan