If you assume costs as follows: - $1 a month for domain - $20 a month for hosting

I'd say it shouldn't be terribly difficult to find audience enough to generate enough revenue to cover costs with even just ad revenue on even mediocre projects.

Though I should also point out that the word 'revenue' doesn't necessarily equal profit.

Are you having a hard time generating even the first penny? What's the niche? Who's the audience? What are the revenue strategies tried?

I've launched a few web apps and a mobile app but have yet to make a single penny. I've a few more as well 'in development', which I may get around to releasing some day...

Basically everything I have built is because I found it interesting rather than trying to make money, so I'm not too bothered. However if it is so easy, where are all the "Hello World" tutorials for bringing in revenue?