Money. I hate to be so cliche but money is the absolute #1 driving force for everything I do / learn / work towards. People say money can't buy happiness, and that may be true, but money can help buy life. Without money you can't see doctors, you can't receive cancer treatment, its more difficult to get a good education without money, it's difficult to do fun things without money. Yes, we're programmers and you don't…
There are bills to pay and mouths to feed. There are also short vs. long term money issues to resolve. And retirement and unexpected future health costs to consider.
Having a $250k sports car is not important to me but having a few million in property investments so I don't need to work is quite appealing. But if I have to lose 10 years of my life away from my passions to achieve that then ... well meh!