No.
Well it would be hard but they will need someone responsible to take care of them and to make in charge that they dont make a mess like Alvin does every time, besides if they are in the real world with us they wouldn't have Dave cause the actor is Jason Lee but it would be hard to act, take care of his own sons and the chipmunks, so I would say a person that is responsible, that wants to help the chipmunks and chipettes for real, and someone who would take care of them, i would say an actor but I think it can be anyone as long it has the traits from before and its not irresponsible like Ian.
depends on which one you are talking about. they were mass produced to be cheap. if you haveo ne in good condition and can find a buyer, it could prolly go for around $100 USD. generally though they cost around $5 USD from a military surplus store.