Hamm isn't the only one, and actors airing commercials is no longer considered "selling out" or damaging to ones career. Ever since Catherine Zeta-Jones-Douglas became a spokesperson and did television ads for T-Mobile, other actors haven't been shy to do commercials in the US.
Catherine Zeta Jones hasn't been relevant, or bankable, for a very, very long time. She wasn't even bankable at the time of the ads, her best years behind her.
Jennifer Aniston has Aveeno, Matthew Maconaughy for Lincoln, Mila Kunis for Jim Beam, Charlize Theron for Dior, not to mention the slew of Cover Girls from Queen Latifah to Taylor Swift, and many more.
All are better brands than whatever tax software company Hamm is shilling for.
His decision remains very puzzling for me.

Hamm isn't the only one, and actors airing commercials is no longer considered "selling out" or damaging to ones career. Ever since Catherine Zeta-Jones-Douglas became a spokesperson and did television ads for T-Mobile, other actors haven't been shy to do commercials in the US.
Jennifer Aniston has Aveeno, Matthew Maconaughy for Lincoln, Mila Kunis for Jim Beam, Charlize Theron for Dior, not to mention the slew of Cover Girls from Queen Latifah to Taylor Swift, and many more.

After being fired, he was forced to star in a series of average-at-best tax commercials.
I have to admit, I'm puzzled by this decision. It's not like Hamm is hurting for work or has taken a hit in his reputation. Maybe the money was just too insane to turn down? But then again, unless the ad is strictly airing in Asia or something, is any amount of money worth that as a knock on your career?