I chanced upon this video by The Minimalists with Ramit Sethi, and though the topic of the show was particularly germane: Why accumulate wealth at all (is it just another sort of hoarding?) and ventures into what it means to live a "rich life".
Listening now, but first answer:
Wealth is a hedge against future uncertain consumption needs. Investing it makes it a better hedge, as you can often preserve your purchasing power and potentially grow in excess of that (increase the value of the hedge). Long-run stock investing is hardly gambling, it is participating in the efforts of people working
really hard (mostly) to earn a return on productive assets*. This is the fundamental, measurable reason to do it, and it depends on your sense of what those consumption needs will be, particularly in the years when you will not be able to, or want to, work.
Certainly for other people, wealth is a way of keeping score, or gives a sense of self-worth. This is sort of the golden ear/hifi status part of the argument, and is similarly worthless.
* I would argue that the *earnings* part of stock returns is
not a gamble, as the podcast question suggests
, but the increase or decrease in *multiple* put on those earnings probably
is. Although multiples seem subject to some mean-reverting properties.
UPDATE/PERSONAL OBSERVATION:
One of the things that confounds my retirement planning is my own lifestyle inertia. I live in New York City, own a country home, and like to travel. I have enough money to safely
choose any two of these things. My wife is particularly resistant to moving out of the city, but I am very attached to the concert-going and ease of restaurants and transportation. So I find myself continuing work to grow the travel budget. Will I feel like traveling and for how long? Could I be happy living somewhere cheaper (probably, although it might be in some non-US city). It's hard to know future me.