We bought a crib when I was pregnant with DS1...and I wish we hadn't. A complete waste - neither one of my children slept in it at all. But that being said, I didn't know when I was pregnant just how much I would love co-sleeping and love the bond that it developed with my children and I (and DH too!). I bought the crib thinking that I would only co-sleep in the early months and then move my children to the crib....but I never did. We did buy a convertible crib at least - so it will get used eventually as a full-sized bed. It also converts to a "daybed" and DS2 (15 months old) does nap there (with a bedrail in place) when my Mom is here watching him because she feels more comfortable with him in there than in my bed. I'm okay with that.
I had to laugh at caedenmomma's post...we had our crib in our crawlspace for about the first year of DS2's life and neighbours or extended family members visiting would always comment on the fact that there was no crib set up in his room. Sometimes I thought it would just be easier to set up a crib "for show" than to have to explain to these people who are not like-minded to me as to why I co-sleep LOL!