well ive only skimmed the thread but i can tell you why I personally work part time:
im a single mum with two kids. i used to work full time for most of ds's early years and i know how tired that made me, even though he was a very easy child.
i dont get any help. when i come back from work my day starts again. i have to keep my house clean, get everything done, still find time for the kids and for myself. there arent really enough hours in the day for me. then there's the garden and DIY too.
Working part time means if a child is ill i can just swap a day and not lose pay or have to use holiday. the same if i have a doctors appointment, or need some repairs done.
i also cant drive and cant afford to learn, for me to work full time it would be school run first and so staying in the office well after everyone else, even with just a half hour dinner break. then it would take me an hour to get home by bus, not in enough time to pick dd up from nursery and no-one to look after her in that time.
so at the moment its not possible...and even if it was, i've worked it out and for all the extra stress, less time with the kids and no doubt a filthy house i would gain an extra £20 a week.
just not worth it.