ya... that does sound a bit whack.
I mean, I can understand that there's some business classes involved... perhaps some symbolic logic (to emphasize on that 'common sense' thing you mentioned)... maybe even some botany (so you know how to increase the survivability of floral arrangements
)...
So sure... you could do it... but that certainly sounds like something you could easily jump into without having to pay for schooling in.
But you can get a degree in just about anything these days.
A "degree" in the field might mean you can jack up your price a bit, though...