Why don't drivers enter other series like Verstappen? F1 Q&A

This question essentially centres on the push by FIA president Mohammed Ben Sulayem to return Formula 1 to a set of engine regulations that are pretty much the same as the era from 2010-13. We delved into this topic extensively last week. There's a link to that article below. Now, as to the specific question, yes, 2013 was pretty boring, or at least the second half of it was. …