However, I then turned to his magnum opus on geology, Annals of the Former World. That was a long slog which, although I enjoyed moments of it, now I wonder if my time wouldn't have been better spent reading something more interesting.
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1) Your salary demands exceed the budgeted amount for the position
2) You probably aren't willing to work insane hours any more
Even if your skill set vastly exceeds that of a wet-behind-the-ears engineer and can work at a far higher level, be more productive, and produce higher quality work, it's almost impossible to make that apparent when interviewing, especially when those doing the interviews are much younger.
Space is big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space.
You do not own your airspace. The FAA owns your airspace.
You can build a tall structure (subject to local laws). But anything above that is outside your control.
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This article, however, is about Ireland.
Whether it be writing or computer programming, or exercising, for that matter, if you aren't willing to put in the work to achieve your goals, why bother?