I agree with dvestors. You have there a nice project. It is a matter of expectations: Is the ROI going to stagnate, decrease or increase? And for what period to come should that be expected? Things can go fast on the internet. I guess that a potential buyer should have an idea to improve ROI for at least 25%, and over a longer period than a year. Then resell it. So, $547.50 seems break-even, and 25% is some $136. It depends if You want to get rid of the domain, or make profit. A domain is worthless, if not yielding any ROI. Success!