Sometimes you don't make enough money to retire early from a combination of bad luck and poor financial decisions. In my career, I followed a pattern of going to a company just a bit too late to get the really low priced options. I've ended up with dozens of former co-workers who are multimillionaires. I had a family and was (in hindsight) too conservative about when I went to a company. I also was a "paper" milliona…
If you are ever in a similar situation you might want to look at what Mark Cuban did to manage this risk - described here: http://investmentxyz.blogspot.com/2006/05/cubans-collar-anat...
You also have to put up a huge amount of capital upfront to purchase the options. For Mark Cuban, this could be done on credit to the bank, but likely not possible for a single digit millionaire.
It was only during a unique period of irrational exuberance that banks were open to underwriting options for such new and untested equities.