etymology - What is the origin of phrase "for fun and profit"?

I don't know about the origins, but it is definitely not a recent expression.
As the following examples found with Google Books indicate, the expression is used since the 19th century at least:

Pamphlets, Religious: Miscellaneous
(1847)

It matters not if you call it a
"fish pond" for fun and profit„or a
five cent chance to get a quilt at a
draw or a raffle given by a Ladies'
Aid Society of Church, or the profits
on editing a newspaper for one day, or
running a railroad

-

The American Angler (1897)

I am now fixing up some trout ponds, a
pet scheme of mine, in which I shall
propagate trout for fun and profit.
The law here is, that no one can sell
trout in market unless from private
ponds, and I shall of course be in the
game.