Ok, here's an update. I've been with Dish within a year or so of their offering DBS. I currently have 2 leased 622s, and an owned 211, 501, and 508. CSRs have not budged on leasing a 3rd receiver, even though I've explained that yes, I actually do own 4 HDTVs, and a fifth 4:3 tube that "letterboxes" and displays 1080i just fine.
A polite email to CEO@dishnetwork to lease an additional receiver got me an offer to lease two additional 722s to replace the 501 and 508 (I only wanted one 722), but that they would cost me $150 (usually $300) for someone to come out and install ?????? Pretty sure I can unhook the "F" connector from the 501 and plug in the 722 without adult supervision (I'm using a DPP44 switch).
So, has anyone been able to avoid the service call fees, or perhaps is it really to verify all receivers are in one place? Other than an installer's van instead of Fedex dropping off the receiver, what do I get from spending the $75?
At least in my experience, the 4 tuner limit is not absolute, and per their internal policies, may be exceeded.