There is a place not far from me that i've seriously considered applying to that is VERY close. If only for that reason ;)
Moving is costly, in dollars, and in changes for my family.
And then my wife would work 40+ miles from work...
If you're in a major city it just isn't feasible to purchase a home within walking distance of your business. In the Seattle area, for example, house prices would be easily over a million for anything nearby
A lot of people don't want it that much, and that's fine - that's why not everybody does live within walking distance of their employer. But if you want something enough, there are paths you can take that open up the possibility, you just need to be prepared to sacrifice in other areas.