I personally think people on here talk down the prices a bit too much. (it should actually be the opposite)
Bikes will find there own market value (or be manipulated by dealers), but you often see them at £3.5K for a 2003-2005, in dealers without those extras.
I was looking at a new BMW this summer and was offered £2.8K as a trade in for my 21K mile 2004 American import.
Every seller wants as much as possible and every buyer wants it as cheap as possible, somewhere in between will be the selling price.
As long as you are happy with the bike just ride and enjoy.
Here is mine (and I am not selling it)