Any real man knows there is nothing more manly than getting laid, and to get laid you have to look good (sometimes). And to look good you can't mix brown and black. So while I agree with alot of the people who have posted, you need the following shoes:
Brown Dress Shoes (often boots like sketchers)
Black Dress Shoes
Crappy Shoes for yardwork (mowing is manly)
Nice Sandals for when it is hot but you need to look decent
Flip-flops for the pool/casual summer days
Sneakers
Work Boots
Aside from this everything must serve a specific purpose, ie sports as someone else pointed out. I play all intramurals so I have:
Football Cleats
Baseball Cleats
Soccer Cleats
Basketball Sneakers
Others that are acceptable: Bowling shoes, golf spikes, turf shoes, etc.
So the target is 10-12, more than that and you are pushing it. But those guys who are trying to be old school and say 1-3 are just plain wrong for the getting laid reasons mentioned above.