I'll give you one: a player that's to date made $4 million (that is to say, more than most people earn in a lifetime, not to mention the $3 million he's due in the next year) doesn't have to worry about paying off a >$100k car over the rest of his life. That I can figure that out doesn't make me smart. That you can't makes you a mouth-breather.
But I agree that there is a lot in life that you can waste money on and probably shouldn't. If you want to find out the circumstances as to why many pro athletes go bankrupt, I encourage you do a little more research.