How many shoes doth a man need? Three, is the conventional wisdom, and no, flipflops and slippers don't count.
Eammon, writing in the comments box on an earlier post says:
1 pair of newish hi-tech brand trainers
1 pair of normal black leather shoes
and 1 pair of knackered deck shoes that I may have no choice but to replace as summer is virtually upon us
(I believe he lives in Argentina, ie below the Equator.)
It's a firm rule that no man thinks he needs more than three pairs of shoes, while for a woman, the notion of limiting the numbers of shoes she buys is as philistine as placing a ceiling on the numbers of books in her library.
Of course there is always a downside to male multiple shoe ownership: it has the potential to reduce the pairs available to his wife.