While it's true that the value to certain buyers will vary, if you do decide to sell, then it is your job to sell it to them. They'll only pay as much as they'll see it's worth. If they're not the most business savvy or entrepreneurial person, they will obviously not see much value and therefore would not be willing to pay a lot. However, if you explain the value and potential additional revenue streams as well as adjusted growth estimates, then they'll see past the current basic revenue stream. Take a look above at iheartmemcache's answer (the really long one). He does a great job at pointing out the possibilities to maximize revenue.

If this angle doesn't work, then try growing the business a little more in the direction of the aforementioned comment for a bit. Once you've succeeded in growing the business a bit and proving the model, go and start selling it again to people whom have contacted you previously.