The point you are missing is that many of us do not have big tech careers. I am very fortunate to have a big tech career, but before I was hit by a stroke of luck, I was doing gig work paycheck to paycheck barely making ends meet. When you can’t see more than two weeks ahead in time, which you cannot do living paycheck to paycheck, you don’t think about the long term consequences because you are not capable of it. The incentive structure is too strong to sell zero days to any external party for those who have nothing to do all day but try to find exploits.