Believing the McDonald's formula was a ticket to success, Kroc suggested they franchise their restaurants throughout the country. The brothers were skeptical, however, that the self-service approach could succeed in colder, rainier climates; furthermore, their thriving business in San Bernardino, and franchises already operating or planned, made them reluctant to risk a national venture. Kroc offered to take the major responsibility for setting up the new franchises elsewhere. He returned to his home outside of Chicago with rights to set up McDonald's restaurants throughout the country, except in a handful of territories in California and Arizona already licensed by the McDonald brothers. The brothers were to receive one-half of one percent of gross sales.