choosejarvis.com -- not really a side project, but doesn't make much money. has revenue of a few hundred dollars per month. Would sell it instantly for $15,000 even though we invested $100k in development.
converthero.com -- would sell this for $10-15k. It's a opt-in popup maker.
> Why do you think it hasn't been as successful as you thought it would be?
Marketing is hard.