I own my own 722 and lease two 612's. It does not matter whether you own or lease; the new exhorbitant "additional receiver" fees must be paid regardless.
Your highest-tier receiver will become your primary receiver and cost nothing unless it's a DVR in which case your account will get dinged $6/mo. Exceptions are the 922 which costs $10/mo instead of $6, and the 501/508 DVR receivers which are grandfathered and do not incur the DVR fee at all.
Additional receivers cost you as follows: Receivers providing outputs for a single TV: $7/mo or $10/mo if it's a DVR. Receivers providing two independent outputs cost $14/mo or $17/mo if it's a DVR.
I don't like this fee structure either. Dish has become the pig they used to accuse the cable industry of being. Their http://dontfeedthepig.com
domain name is long since abandoned.