Only a budget DH would buy any item in any slot without Dex.  I understand how set bonuses work, but a DH would rather have boots with 100 Dex and Movespeed *only* than every stat those boots have.

If only a super budget (since those boots have only one stat (Movespeed) that is relevant to a DH) player is going to buy them, he won't be paying 3 mil.