It's not weird to see your favorite Hollywood actors pushing products on Japanese television (Lost in Translation (2003) had a whole plot point revolving around the idea). If you want to see any, do a search on YouTube and you can find several featuring actors like Arnold Schwarzenegger, Nicholas Cage, John Travolta, Audrey Hepburn and even the great Orson Welles. As an example, here's a favorite of mine in a series of commercials for Suntory Whiskey where Peter Falk (A Woman Under the Influence (1974), Wings of Desire (1987)) plays a bartender:
(Uploaded onto YouTube by user callfromthepast3)
But Japanese actors pull in their own work too. It might not offer the room to stretch their acting chops and show off their abilities, but if it means a paycheck, then why not have some fun and do a few commercials?