If you hit the green button you either get $50 million or 0$. Hitting the red button gives $1 million.
Unless you don't want $1 million or don't need it, you're going to hit the red button and not the green button.
Somewhere around $3 million is probably where I'd switch buttons.
There are 20 people in line ahead of you. Each one of them hits the green button, and you physically see that half of them made $25 million.
Would you not be tempted to hit the green button?
$1 million will make a big difference to me, but in many cities it's not enough to retire on - especially with children. While $25M isn't worth 25x more to me, it's certainly worth a heck of a lot more than $1M.