"Education is important, but big biceps are importanter" is not wrong because "importanter" is not a word, there also needs to be a period and education needs to be capitalized. Grammar win: Education is important, but big biceps are more important.
Welcome Girl Scouts, go away Door to Door Salesman! "Unless your selling Thin Mints, NO SOLICITING". This would be great for thehome front door on a small sign above the doorbell or on the glass door of a business.