Not everyone works for money. In fact most people I personally know (no, I'm not sure that's a good representation) don't. What is quite common though among large groups of people is that they get extremely bored and lonely without their jobs. It is frightening to talk with people and find out that they would have nothing at all to do if they would not have their jobs; their hobbies (if they have them) don't give them enough satisfaction to do them longer than a few hours a week.
I don't have to work but I find myself working more as I enjoy it even though I have hobbies to keep me busy.
most people around me work exactly for money. even when they like their job (ie I do), there are roughly 1 gazillion other activities that are just better, and life is too short. also, if you have children, you want to spend as much time with them as possible, there is no upper limit on that.
You would think that, but most people who retire early get really board in around 6-12 months.
Often your friends are working so they just don't have a lot of time to have fun on week days. TV is much worse in the middle of the day. Sure, it seems like adding 40 hours a week of free time would not change much, but it often feels like 4x as much free time due to all the unnecessary activity's around work that suck up time.
Finally, many things are fun while your tired at the end of the day / week to unwind, but get boring when your wide awake and full of energy.
I have had 5 people die shortly after retiring (early); stress (was this all?), depression (suicide) and general boredom which leads to depression. I do not think you realise how much time you really have on your hands when you are not in the ratrace and how few people deal with that well.
I don't have to work but I find myself working more as I enjoy it even though I have hobbies to keep me busy.