C++ lacks a feature set that would make developing a web application compelling.
How much customer development did you? Did you ask anyone whether this was their pain point or whether it was something else? Was there a niche market that just hasn't been able to build a suitable solution for 7 whole years? All of the possible benefits that people have cited such as speed, portability and familiarity to a niche audience don't make much a difference in web development due to the kind of development, the options already available and the kinds of platforms commonly in use.
I have this sickening feeling that you spent 7 years of your life and a significant portion of your savings working in isolation on a product that may not have any real market to sell into.
Some people are saying "Oh he just did this to be a hacker". I don't like this argument. I don't think it's alright that a talented engineer, a significant source of productivity and innovation for the people around them, would spend a significant amount of their work life (7 out of about 35 years or 1/5th of their most productive years as humans) developing something that doesn't have much value or doesn't solve a problem people have.
Am I the only one feels this way?