I've been an MBA program prof and seen
what MBAs have learned and done.
There are some advantages to having an
MBA; at best, these advantages are terrific.
Sadly one of the best of the advantages is just
meeting the other students -- something like
the advantages of being in a good country club
where know that everyone else has been carefully
selected.
And you can learn some business basics in accounting,
finance, organizational behavior, business law,
statistics, and maybe something about information
technology, production, management, etc.
Mostly the universities run MBA programs to get the
tuition revenue and, later, the alumni financial
gifts. But mostly a university wants to do 'research',
and the MBA program is a bit far from that. Mostly
the rest of the university wants to turn out college
profs which, however, usually don't make much money
so aren't good bets for gifts. So, a university can
swallow its pride and run an MBA program.
For some students, an MBA can get them on a good
start in business. Alas, for someone already successful
on business, an MBA is highly questionable. E.g.,
for someone already successful, they no doubt meet
lots of people, even ones better to know than other
MBA students. For accounting, after a few tax seasons
and discussions with a tax lawyer, likely know a lot
about accounting. For business law, working with a lawyer
a little will likely teach you all you need to know about
that. Really the main thing you need to know is your
business that you are making successful.
So many people see these points that a university might
have an 'executive MBA' program where they can
get successful business people through in less time
with less bother.
There may be some direction for you in the future where
something in an MBA program would really help you,
even be crucial, but this is not clear. Or, can look
at a lot of successful people in business, e.g., Gates,
Page, Brin, without an MBA. Or, if they want an MBA,
then they will hire one.
My guess would be that an MBA program would be a
waste of time, money, and effort for you and also
possibly a severe shot in the gut of your career.
Indeed, many profs will feel guilty that somehow
the university had gotten you to leave your successful
career, and likely hurt it,
for the university's questionable material.
If you can find an 'executive MBA' program
at a good school and really have the spare
time, then maybe okay. Otherwise I'd advise
you to be very careful and actually go for an
MBA only if you could find some astoundingly
good, special, and unique reason. Stay with
your bird in the hand and be less interested
in the two birds in the bush.