As an ex-dancer and qualified teacher, I was concerned to see used pointe shoes for sale on Ebay.
As you will probably be aware, pointe shoes are hardened at the toes to allow the dancer to go up 'en pointe'. When the shoes are worn, the toes soften slightly and are gently 'molded' to the shape of the dancer's foot. This also happens to the leather inner and outer sole of the shoe.
I would urge dancers to buy new shoes and have them fitted by a specialist - even an experienced dancer, as the feet change shape over time (the blight of a ballet dancer are usually bunions and corns - very elegant!) and not to buy shoes that have been 'broken in' by anybody else.