This is where I have a problem. I have at least 25 bikes. It's too many I know, but I do enjoy most of them most of the time!
And hey, you've got to have at least: 1 x fast road bike, 1 x winter/tour/hack (panniers) road bike, 1 x hard tial MTB, 1 x FS MTB, 2 x CX, 1 x gravel, 1 x TT, 1 x Fat. Plus, a stupid sentimenal bike. That's 10 for anyone :-D