The goal of FIRE is not common with most of the people I know - but it is not because they are spendthrifts or have a lack of savings. I think it has a lot to do with one or more of the following: 1) Insecurity about making a change in their lives 2) Their identity and self-esteem is directly connected with their career 3) They like their work (or at least not hate it enough to quit) and so don't mind getting paid for something they like to do anyway 4) Their work serves a social purpose as their closest friends are their coworkers and leaving their job would leave a big void in their lives.
I have 2 friends in their mid 60's who could've retired years ago but continue to work full time. One holds a high position with the Federal Govt. and the other is a lawyer/executive. Both earn very high incomes, are very frugal, have their homes paid off, and have considerabe savings and investments. I think both continue to work because they identify closely with their jobs and maintain their sense of self-worth and value from their employment. Sometimes, I think some people feel that once they leave the workforce and are "retired", they have lost their status in life and are "out of the loop". They earn a lot of respect from being a doctor or lawyer or whatever. I also think that it might be hard for some people to walk away from a very high salary, even if their savings are such that they could easily live off the interest and dividends from their considerable savings/investments.
I have a cousin in her 50's who could also retire. She owns high-end rental property, is a prudent saver and investor, and her husband works full-time. She doesn't really need the money but continues to work because she likes structure in her life and her closest friends are people from work.
I don't know if the aforementioned kinds of people are in the minority or not, but it is true that FIRE is not for everyone - and not only because of a lack of money.
I was at the grocery store yesterday and saw either a Time or Newsweek Magazine cover about Ambition, and then quickly perused the article inside as I waited in line. From what I gathered, research seems to indicate that the drive and motivation for material success (ambition) may not only be innate but may also be influenced by family background, family income level, parent's expectations, etc. The article highlighted people like Donald Trump, Martha Stewart, Tiger Woods, Jennifer Lopez, Bill Clinton, etc. An interesting read.
I think the FIRE people on this board can be considered somewhat "ambitious", but only up to a certain point! Then, we are willing to "let our guards down", forget about being competitive, and turn into aimless drifters who are willing to have any kind of fun at the drop of a hat. Just kidding. Just kidding.