Sounds like a sales rep screwed up on the order. But when they go to activate, they are in for a rude awaking. Because as already mentioned, DirecTV will not allow 2 Genies on the same account anymore.

Two dishes? You can run hundreds of tuners off a single dish with the right headend. There is NEVER a reason to have more than 1 dish - unless we are talking a dish for additional sat slots (like international channels).
Or a wiring issue, where it is more feasible to put a dish near where another group of receivers are going; ex. pool house, detached garage, electrician wired estate home :)