I'm hovering right around Mikey and Kevin's number. Unfortunately for me I buy most domain names on a whim and normally have no clue what I'm going to do with them.
I have about fifty domains, plus I manage several others for customers.
I don't use them all, of course. My primary domains, I buy the .net and .org to, and where I can't get the .com, I pick up both the .net and .org. Some domains have ideas that didn't pan out so I'll be letting them go, and others, I have really good ideas for but haven't gotten around to >_>