IŽve got 10 bikes, old and not so old, and I certainly ride them all. I am of the opinion that a bike needs to get ridden frequently just to keep everything in a good working order.
Obviously, if you have a very special bike you need to be extra careful with it when out riding but it still needs to get out on the tarmac. And youŽll never be able to fully appreciate a bike if you never ride it.