(from A-Sitting On A Gate)

But I was thinking of a way
To feed oneself on batter,
And so go on from day to day
Getting a little fatter.
I shook him well from side to side,
Until his face was blue:
"Come, tell me how you live," I cried,
"And what it is you do!"

- Charles Lutwidge Dodgson (noted mathematician)

To answer the query posed...

Other examples of suitcase businesses would be "mentoring," "counselling," being a distributor, being a decorator or a hairstylist, being a PR guy, running an internet business.

But the BEST ones are being a lecturer and being a mailorder dropshipper.

- Craig