really, once you have bought and ridden the bike, the value goes down say 200+ if you spend say 500 on mods, you may get an extra 150 - 200 on top of the bike, these really de-valuate quickly, for something like a stock pitpro rr with lifan and all that cost say 700 new, once it is say 6 months old i would pay around 200 -300, maybe 350 for it. hope that gives you an idea of how much your bike is actually worth. hav u sold it yet?
cheers