I knot the ends for several reasons...
#1 I don't have a LLC company and if a kid chokes I can get sued and lose a lot!
#2 If the ribbon slips out of the toggle when my customer is styling their hair it will be annoying to them and they might stop buying them.
#3 If the toggle gets lost in public because it came off the ribbon then I would have both an annoyed customer and it could possibly be found by a kid...who could choke.
#4 I think they look more "finished" with a knot at the ends