Yeah, right. I'm not asking about pricing strategy for a web based product but how to determine how much my web application is worth if I want to sell it. For e

Yeah, right. I'm not asking about pricing strategy for a web based product but how to determine how much my web application is worth if I want to sell it. For example, sites like threewords.me isn't generating any revenue but still it has been sold at some price. How to determine the selling price of such web app?