When did the Chelsea players have time left to train rather than sleep with a French model?
When did Wayne Rooney have time to visit a brothel (while he was still with Everton) instead of going to trainings?
When did Ashley Cole find time to play games when he was busy with his mistress?
In other words: I wouldn't like to keep track of the number of celebrities who cheat on their partners, drink, do drugs, ... or any other thing that should stay out of the limelight to protect their public image.
In a way it's none of our business really. Who cares if Tiger Woods slept with 10 women the day before he wins a golf tournament? The winning of the tournament is public business, the rest isn't. Period.
As for commercials, he can probably cash in on his new image and find new sponsors to replace the ones that dropped him. Imagine this commercial:
Tiger Woods, with a really seady look on his face and with a revealingly dressed girl lurking to him, walks into a dark alley in the red light district, puts some coins in a condom vending machine ... and then the slogan comes up: "Durex. If you want to be a real Tiger in your bed".
For every sponsor he lost he can easily get a new one

Point is: those sponsors signed him because he plays good golf, not for his private life. I still think it's silly to ditch him for things that have nothing to do with the reasons why they signed the deals in the first place. Also, one has to be very silly to buy a product just because Tiger Woods fakes to use it. I saw Gillette razorblade commercials with less than 10 seconds of Thierry Henry and Roger Federer claiming to shave themselves with Gillette ; what a waste of money I'd say, because would any man really suddenly buy a Gillette razor with the sole motivation that Federer would use it?!