I see it kinda overpriced even tho I recognize there's a lot of room for improvement. But in a business as volatile as internet, basing your figures on 2/3 years ROI is simply crazy. However, you'd wait and develop it for a few months and maybe those figures will be more appealing. I understand that you did a great job with that site, therefore it's kinda hard to believe the site can be developed much further than that, your own good work is the proof. I know how to do money with that site, more than what you're doing now for sure, but not everybody has that knowledge, hence, you'll need to get to the market price or keep it and drive it to a more interesting income.
Anyway, good luck with it
