I know people who were dead-set on ideas, put everything they had into it and literally lost everything. There are many places/situations where time, funding, and cofounders are vastly less available.

Lets look at it in reverse: why do so incredibly few people execute the most obvious, high potential startup plans? Because there are innumerable costs that those who are already at the top have lost their ability to accurately consider.

All I can say is, good luck all.