I think the lesson here is if some want a 2nd H3 is that they MUST deal with USA CSR's and AFTER being denied, then get kicked up or get numbers to Loyalty, CEO, on-line feedback, whatever dept., etc. that has authority to make 2nd H3 happen.
Usually Dish will only require that you purchase (at full retail price) from them or you can purchase 2nd H3 from a 3rd party retailer at a lower price (like those mentioned on this thread), and Dish will (at least has always done in the past) provide all necessary support switches, LNBF's, labor, etc. to make it all happen.
Usually you will be told that the 2nd H3 is ON the work order and that the tech will know that the customer will have that 2nd H3 at the site, and then the tech takes your 2nd H3 and does all the work and provides all equipment necessary to install the whole system because the work order states a TWO H3 install with customer providing 2nd H3. You can confirm on the phone with Dish at time of setting all this up that there will be no additional charge to you so long as you purchase that 2nd H3 at your own expense from whomever, if a tech dares to charge you extra, call that same special rep or office back and they will set things straight with the tech. As long as you provide the additional Set-top box, Dish provides all the other support equipment at NO extra charge to the upgrade price. At least that has been the way Dish has handled such installs in the past, and my last experience was 3+ years ago for TWO H3's.
Sometimes there may be bumps, as it was with my TWO H3 install. We had to call my special rep, but he was gone for the day and so we could not get the 2nd H3 up and running, but I told the tech to just forget it because the rep mentioned I may have to call him to send the hit to have it function (because at that time ONLY special reps could authorize the FIRST hit for 2nd H3 as part of initial install). After the tech left, I felt he didn't do the full software download because the 2nd H3 was not seen on the network (from previous installs going back to the 721, those boys didn't follow through on doing a hard re-set and/or further attempts at downloading software). Anyway, after doing it MY WAY, the H3 was finally seen on the net and was requesting authorization, it was evening already, so I emailed my special rep to please HIT the 2nd H3 (providing the proper Receiver ID #), and went to bed, and then woke up the next morning to see my 2nd H3 fully functional and letting me watch TV and record, etc., with a confirmation from my special rep via email that he sent the hit.
I add all that above because I don't want people to get frustrated or give up. A 2nd H3 or a TWO H3 at one time install is not a common install, and there are sometimes a few hoops to jump through even AFTER the tech as done all he can, and even the tech may not get it exactly right. Just be certain to get the name and number of the special rep you had dealt with so that if there are any wrinkles, they know you and the history and can fix things for you.
FWIW, there are some households, such as mine and the OP's where a 2nd DVR STB is legitimately needed, and so it keeps the peace in the house if certain people or groups have their OWN DVR to themselves! There is no way that the two of us would have enough HDD space for all our recordings if we shared one H3, and dear OLD mom would never be able to weed through my recordings to get to hers. She has slight dementia and so having her own recordings all to herself allows her the ability to find what she wants without her getting frustrated. Yeah, I know about Custom Folders--we still would not have enough HDD space to share on ONE H3-- but it is so much easier for her knowing it is all HER recordings.