If you don't want to sell anything (an app), and you don't want people to pay you for your skills (a job), I see two possible routes: a) have very high quality

If you don't want to sell anything (an app), and you don't want people to pay you for your skills (a job), I see two possible routes: a) have very high quality content on your blog behind a paywall, b) have very high quality content on your blog along side some types of ads. In either of those scenarios, you are going to need a very large amount of traffic in order to sustain yourself long term.