Trust me, taking one project and not giving up until you MAKE IT WORK will be much more profitable in the long run.
This sounds like it could be recipe for burnout and a waste of your life. Some businesses won't work no matter how hard you try. It seems like the best strategy would be one that is good at finding a reasonably scalable business model. If you don't find one after a few iterations, it might be a good idea to try something new.
Maybe I should have added a corollary.
I'm assuming you already have a solid business model, or at least a well-defined market. "Adsense" is not a business model.
Also, monetization is NOT hard if you're selling something people want.
Getting traffic is hard. Monetizing is trivial if you're running an actual business and not a hobby.
And what, pray tell, is the difference between a business and a hobby? I became an entrepreneur precisely because that allows me to focus on doing what I like doing and doing those things in a way that I can feel good about myself. To me, that means my business /is/ a hobby, even though I'm full time on it now.
That's absolutely true, which is why the 'throw it at a wall and see what sticks' method is really good to find out what works and what doesn't.
Making 400 sites that all work is undoable. But making say 10 sites that work and that all contribute a bit is definitely a workable scheme (see above), but it still won't make the kind of money that it potentially could because monetization is really hard.
Solve the monetization issues and the thing looks a whole lot better right away.
But reliable ad networks (both in not serving malware and in paying out on time (or at all)) are few and far between.
Sticking to one thing and doing it well has made me lots, trying the '400 different projects' (ok, a bit less, but still) worked to some extent but definitely not on the level that Max makes it seem should be trivial to achieve.
And that's with me being free to dedicate 100% of my time to this stuff.
This sounds like it could be recipe for burnout and a waste of your life. Some businesses won't work no matter how hard you try. It seems like the best strategy would be one that is good at finding a reasonably scalable business model. If you don't find one after a few iterations, it might be a good idea to try something new.