I can understand that but like I said what mods come with it mean something. With mods by
ebay standards is a "high performance air filter that adds 25mph, at valued at over $65!!" (you know how ebayers are)
Where as mods to me would mean filter, pipe, maybe carb & rocket key as a basic upgraded bike. (That would significantly adjust the base value of a bike).
The mods I mention would have a definite impact on pricing where as a filter/stack would be worth a price difference of maybe $5.
It also depends on what your goals are. Do you want to move less bikes at a higher price or move more bikes at a lower price and work your way up.