Were you born so rich that you can spend all day hanging out with your friends, without worrying about money? Most of us were not.
Many people here (myself included) claim that they are working really hard so that they can get enough money to be able to do whatever they want for the rest of their lives.
For me, at least, the idea of working really hard for a short period of time is way more appealing than some 9-5 job where I show up every day for the rest of my life, regardless of how hard (or not) that I am expected to work.
You aren't getting around the fact that you need money; until you solve the problem of food, housing and medical care for the rest of your life, earning money is going to be a problem that will take time away from finding whatever it is that makes you happy.
Even if working makes you happy, having enough money that you don't need to work gives you a huge amount of leverage and freedom that will allow you to turn down work that isn't conducive to your happiness.
pg, actually, has talked a whole lot about this, and about how maybe we should try to change things so that founders can take out more money early on because of this.
ref:
http://paulgraham.com/vcsqueeze.html
"My second suggestion will seem shocking to VCs: let founders cash out partially in the Series A round. At the moment, when VCs invest in a startup, all the stock they get is newly issued and all the money goes to the company. They could buy some stock directly from the founders as well.
...
In fact, letting the founders sell a little stock early would generally be better for the company, because it would cause the founders' attitudes toward risk to be aligned with the VCs'. As things currently work, their attitudes toward risk tend to be diametrically opposed: the founders, who have nothing, would prefer a 100% chance of $1 million to a 20% chance of $10 million, while the VCs can afford to be "rational" and prefer the latter."