Just one at the time being. I was going to buy another (even was about to put a deposit down on a Campag groupset) one but then I got laid off, so that put that plan down the drain. In the past I have had two bikes as I used to ride to work (still do as I don't own a car, but I have a drivers licence), so I used that for work and another for training/racing.
I know somebody who owns (or did anyway) about 7 Trek Madone's (he used to walk into a bike store and buy it there and then) and a Trek TT bike. But the winner for me was when I was at the 2007 TdF and on my tour group there was a Colombian-American doctor (who lived in Miami) and he owned (IIRC) 35 bicycles (Trek, Colnago, Pinarello, you name it) and then he had 121 clocks in his house as well. Talk about OCD
I know somebody who owns (or did anyway) about 7 Trek Madone's (he used to walk into a bike store and buy it there and then) and a Trek TT bike. But the winner for me was when I was at the 2007 TdF and on my tour group there was a Colombian-American doctor (who lived in Miami) and he owned (IIRC) 35 bicycles (Trek, Colnago, Pinarello, you name it) and then he had 121 clocks in his house as well. Talk about OCD