I have launched 3 products (an appointment scheduling SaaS, a Twitter based sweepstakes management service, a private beta of a social product review/recommendation site) and about a dozen apps. Only the appointment scheduling venture was sold to a third party for the code base which had about a dozen free-tier users at the time of the sale.
The social product recommendation venture did not go further because the co-founder did not want to continue going forward. I still believe it's a great idea but I put it on the back-burner for a while until I can find another co-founder.
At the moment I am working solo on an app first service (subscription based) and would like to have a more successful launch this time around.
PS: If anyone is interested about the social product review and recommendation site let me know.