Can We Talk Value? I accidentally bought a cavalier?

Ladies and Gents,

I don't usually have a hard time with pricing vehicles and usually use the standard KBB values to buy and sell but now that I am in a place where it is time to sell the e38 I feel that the reflected KBB value for my car does not reflect the actual value of the car itself or the driving experience or condition for that matter...

KBB suggests that private party value on my car is $3500. Here is the low down on my car.

1997 740i
RARE color Combo and rare "i" not "IL" status..- Black on Black
167,000 miles maintenance up to date and regularly serviced
18" M-Pars with good tires (or style 5's for that matter)
Nice set of tail lights and Headlights (also Xenon HID's added)
NEW CONTROL ARMS
Tinted and recent shadowlined.
Everything on the car works and the paint is in good shape.

How is it possible that a car that is in great shape, that runs this well, and gets compliments left and right is only booking at $3500? It gets 26mpg on long trips to canada and back, and 22 around town..What barganing tools do I have when RETAIL value is only $5000? I don't need to sell per say..But I really want to. Keeping the E38 is not a long term option. I have my 99 540i 6speed M-Sport E39 too and this sale would give me the opportunity to pay off a chunk of the wifes car and do minor repairs to the E39. I see junk cars (bonnevilles, centuries, cadillacs, etc) sell for more than $3500...

I guess my question is can I realistically expect to sell my car for more than book value? I see a mix of people asking anywhere from $7500 down to $3000 for various condition and mileage 740i and 740il cars with various issues... Im bummed and feel like someone just valued my car in the same realm as a cavalier.