GT5 Promo Disk

[GTPVenomZombie]

Hello all, GTPVenomZombie here and I would like to know if this GT5 Promo disk is considered rare and worth buying. Thinking of starting a GT Collection. Someone please explain to me, I`m don't have very good knowledge with Promo disks and demos etc. As in I don't know whether its rare or worth something.

http://www.ebay.co.uk/itm/Gran-Turi...839?pt=LH_DefaultDomain_3&hash=item43df1e2a07