When I traded my '07 919, the dealer offered $4,300. Add in the tax savings and it bumps to ~$4,600.
I bought it in the spring of '09 for $5,700 with 2.5k miles, put 35,000+ miles on it and kept it well maintained. I took the offer, partly to avoid the Craigslist hilarity, and also that's about what I expected to sell the bike for.
3 years of riding for ~$1,100 (plus gas, maint, & mods), not bad!
CB550-Four; CB750F; VF1000F
750 Nighthawk; CB900F; CBR1000rr