Resillience comes into it too. As the partner of a high earner there have been so many times when I've just had to deal with stuff. Many, many couples don't make it in our world and the knock on effect on finances and family wealth is huge. I think I might throw loyalty into the mix too.
Not just resilience within the relationship either but I recall when the children were six and three, I was recovering from laryngitis, dd had had a tummy bug, ds broke his arm which had to be reset. DH was on day three of a case in the High Court and booked into a hotel. DD had to be farmed out to my best friend. The comments at the hospital about support were inappropriate and implied DH was up to tricks, similar comments were made in the playground (leafy primary back then) about how I shouldn't put up with it and it wasn't fair etc. But, if I hadn't been able to cope with that sort of stuff and if DH's attention had been diluted and he had been perceived as unreliable at all, then he wouldn't have been as successful as he has been. Likewise if he had ever had to worry about milk, bread, the boiler, a clean shirt, it would have been a major distraction.
I do think, however, that our marriage strengthened when I went back to work when the children were both settled at school but although I work 8.45-5.45ish most days and am not terribly taxed I work as hard as he does because I organise home, properties, dc 21 and 18 now. I don't quite work full time because I have an additional four weeks of holiday, which I appreciate is a massive bonus.
It's all part of a puzzle but I can honestly say that it was never his or my intention to end up "minted".
What might be of interest I that I worry for the children. Whether they have had it too easy. Whether they will be taken advantage of. On the whole though they aren't spoilt. They've never had the latest phones, designer anything, etc. and perhaps that sums things up a bit. We live in a smart neighbourhood, shopping this morning everyone was quite well dressed and well spoken but there's very little evidence of flash. Much of it is relative. The South East, especially SW London/Surrey is not like the rest of the country.