Maybe they should get Dan Castalaneta for the commercial. It doesnt matter if kids know him or not, he could voice a hundred clickies differently and proffesionaly.
Might be something to think about at least. If the actor or actress can provide interesting voices for the clickies seen in the commercial, that would appeal to children while knowing who it is would appeal to the parents.
Dan isnt that well known for his appearance though, just for his voices on the simpsons (homer and lots of other characters such as Krusty, grandpa, groundskeeper willie and mayor quimby. )
Mark Hamill however, is well known to adults and is also a proffesional voice actor. Considering his career is not that great anymore he might not ask as much since it could be great publicity that advertizes his vocal skills.