There have indeed been a number of webapp properties that have successfully sold on Flippa. An additional consideration to those raised by flipfilter is that the more serious of these buyers are going to want to see revenue and usage metrics (note that if the problems you mentioned about your venture are serious enough, it will impact your sale price). Let our support team know you came from HN if you go ahead and we'll do what we can to work with you on securing a successful sale...