Why are porn dvds so expensive?

[WheresDave]

... i dont know, it just seems that they are to me, well maybe thats to do with being in Australia, though from what i have seen most are between $30 - $80, generally most being around the $40-$50 mark. A new release non porn movie will be $30, before long it will be down to $10-$20, so howcome it is porn dvds are generally alot more? (i'm not saying thats not always the case, im sure you can pick up cheap ones too)