Addressed to an individual, informally, one would probably say 'viva mas' or 'mas vida'. Collectively, as you note, 'vivir mas' certainly works.
I'm hardly the Spanish expert, but I do live in Cocle, Panama, and a couple of local friends to whom I read this bit of stupidity said 'el (meaning Burger King) es sin cerebro.' And, I'm reasonably certain from the tone of voice that he was being polite.
Where do they find these dipsticks in ad agencies? Or has Common Core a Spanish version? Or is esperanto making a comeback?
Sheesh.