For me there can never be too many.... I like the equation of X+1=Happy..... with X being the number of bikes you currently have.

My fiance however has a different take on my "herd"- I have ENOUGH. She put the law down with "If you want another bike, you have to get rid of one that you have already". I have since bought three more without getting rid of the pre-existing this brings my herd to 7 bikes. When I flipped the table and told that she had too many fishing poles, she took all but two of them down to the beach house and left them there.