Re the lottery question.
If I won big on the lottery, I don't know if I would continue in my current job. I like my job, like my colleagues and appreciate the flexibility/reasonable hours, which are highly unusual on my sort of salary. At the same time, it's quite stressful when I'm there, and I would like to have less stress in my life.
What I do know for certain is that I definitely wouldn't want to give up work entirely, though I would consider moving to a less stressful job. If I stopped work entirely, I know that I would struggle with the lack of routine or structure. I would be much less organised than I am now, and I would use my time much less productively. I would end up achieving very little and then feeling rubbish about it. That isn't a comment on other SAHMs, by the way. Just a reflection on my own nature. I thrive when I'm busy and get depressed when I'm not.
Thinking about it, I'm not even sure if I would move to a less stressful job, if money was no object. My current job is stressful because I'm in quite a senior role, with responsibility for significant projects and a lot of staff. Stress goes with the territory in that kind of role, and I don't like it, but on the other hand, I do like having the power to make things happen and to shape what we do - my work gives me a huge sense of achievement. I would miss that if I stepped down to a less stressful role.
My ego might also miss the status that I guess I've kind of got used to.