I cannot possibly agree more strongly with this. While I still have an internal fire that wants to put a couple more commas in my bank balance, the ability to experience life however and whenever you want to is, once found, not easily let go.
My wife (a teacher) and I live abroad, and the nature of her work means she has effectively ~90 days of paid vacation (not including weekends) each year. I'm not certain what our life would be like if I were still an executive, but I'm sure that our relationship wouldn't be as strong without the shared experiences that come from being able to take advantage of that time in a meaningful way.
Time is the limited resource, not money. You can always get more money, but you can never get more time.
Many (most?) people forget that.
Before: One of those Google/Facebook/Twitter "Total Comp" numbers that nobody here believes whenever Bay Area salaries are discussed. Upwards of 40 hour weeks, though I did drop down to 4 day weeks for the last year because, hey, I can live on only 80% of a fairy tale number that nobody would believe if you told them.
After: Normal Bay Area Developer money, of the sort that the other half of that discussion above make. Or maybe a bit less. But the "Hours" side of the equation is where it all gets made back up.
I just spent 3 months traveling through Southeast Asia with the kids, Rock Climbing, Surfing, Getting Married, Riding Elephants and Building Sand Castles. The biggest work week I had involved maybe 10 hours in front of the computer.
Realistically, I could coast along like this indefinitely (thus the "retired" interpretation of my current situation above), but more likely I'll go back to 5-20 hour weeks building out features in the existing products and shipping the next one.
That's what you're buying with all this "Entrepreneuring". The ability to replace your old income with a new one that doesn't necessarily require you to work full time for it.
If you like doing things other than sitting a cubicle discussing where to go to lunch, I'd highly recommend looking in to it.