When I traded in my '08 SERK for my '09 SERG, the salesman was up front with me and said the bike is not worth anything extra with you mods on it, at least to us. I asked if it were showroom stock, would the trade in be less and he said no.
That night I stripped all the mods off the bike and put it back to showroom stock.
I then sold my mods on here for a bit over $2500.
I know to the public, the mods may help sway someone to your bike instead of another with less mods, but it may be just as profitable to you to convert it back to stock and sell it that way and then pedal your mods as used. I know that if you have front fork mods, that's a bit hard to return back to stock, and I wouldn't want to. Maybe keeping new upgraded rear shocks on the bike too. They might give you an edge over someone else.
Just a thought.