Besides their rakish good looks? It appears the failure to hire an accountant.
As the pimps over at Pro Canes point out,
The Internal Revenue Service says Arizona Cardinals safety Antrel Rolle understated his taxable income by more than 50% during his first two years in pro football, sending him a $2.2 million bill for back taxes, interest and penalties.
I know a good accountant who will do everything for $250 A YEAR. Go ahead guys, email me. 
Remember, always bet on black...
And pay your taxes.