So you're telling me that bike a) 2010 gsxr 600 with 10k km all stock is worth exactly the same as bike b) 2010 gsxr 600 with 10k km, full exhaust, power commander, marchesini rims, ohlins shock etc.. ?
To the average buyer, absolutely yes. And that's why I agree with selling the aftermarket parts separately. You're pushing the boundaries of what I consider common mods though with full exhuast system, new wheel and suspension components. Someone who appreciates those mods might be willing to pay a premium for them. I see this happen when one track junky sells to another.