One consideration is that since most of us are runners, that means we are also goal setters and goals setters who continually adjust those goals based on current performance (and that adjustment is almost always upward based on good performances, and not downward because of bad performances).
So while someone may start out with a goal of $500k in retirement account and $100k in savings by age 40, once you start closing in on those goals, they shift. The result is constantly having some difficult to achieve goal that is off in the semi-distant future.
First I wanted to have a certain amount in my retirement account. At this point, I now have a higher total number in my mind that will not only be tough to meet, but I also have a goal of having my mortgage paid off before my oldest graduates from high school in 9 years. Of course, setting aggressive goals is what makes us good runners and is what has created the degree of financial security that any of us currently enjoy, so this isn't an inherently unhealthy things, but it is a very easy way for us to constantly induce stress, even if we know in our hearts that we will not end up homeless or asking for handouts should things go a little sideways.