I worked as a technology analyst for many years and when my kids were born opted to go part time, working from home. While the routine work came through, those 'interesting little projects' that makes work so interesting dried up, partly because I lost sight of the interesting little problems that cropped up that would make interesting little projects.
After about 4 years, I was in the situation where I was being paid really quite a lot of money for not doing an awful lot. The CEO was was very nice and we would meet up sometimes and he would say "I promise there will be something very engaging to work on soon, we value your experience"
But in the end, I ended up resigning, despite the fact that they wanted me to stay on and pay me lots - I just couldn't keep taking their money in good conscience. Shame - it was a great firm.