That kind of endorsement seems so meaningless. Why should I care if Tiger Woods advertises a particular watch? I'm sure he only prefers the amount of money they paid him over the money offered by other watch companies, he doesn't care about the watches. Even IF he is a fan of Tag Heuer watches, why should I care?
Now if Tiger prefers one brand of golf clubs or golf balls that might be meaningful. I'd still suspect that money bought an endorsement. But at least if he is playing golf with a certain club it gives me confidence that the club is a reasonably worthy product.
In the watch industry the only endorsements that sort of make sense to me are fashion icons, especially in promoting womens watches.
But do you think the general public is influenced to buy a certain watch by celebrity endorsements?