I don't understand it either. In the last couple of years, I've known a couple people that came into some significant money. Not lottery type millions, but enough to pay off debt, buy a house, etc.
Both are broke with nothing to show for it and one with a huge tax debt to the IRS.
I would put away an amount to "blow" and the rest would have gone towards financial security and independence for me and my family.
And if I ever do win the lottery, I hope I have the same plans and don't go hog wild.