Aside from the money, there's a whole world of hassle outside work in the military which just doesn't exist in 'civvy street'. Secondary duties become a major pain and constantly wondering where the next posting/detachment will eventually become a drag. I like going home and forgetting about the day's work completely. My other half can't do that.
I turned down the opportunity to become a civil controller when I was 18 to join the military instead. Do I regret it - absolutely not. I was glad I left the RAF when I did, however, because the Service had gone downhill in several ways. Sure, I would be wealthier now(or maybe the ex-wife would have got a better settlement) but I have so many great 'experiences' to look back on and, in the early days, the sense of loyalty was something that has never been matched.
It was a long and (far too) difficult journey to get my civil licence.