This is purely speculation on my part
I answered this in my first post. Flex/Flex24 accounts are not "Siberia" for people with bad credit. Some people choose to have this type of account due to the benefits it provides. First off, PIA accounts have no unauthorized charges on them, being that charges are prepay. If I have a kid who likes to order movies (Adult or Disney), I can be assured that I won't be paying a $300 bill because my kid will have to pay for them upfront to watch them. Also, the Flex (no commitment) type of account can be turned off whenever and turned back on without worry, great for summer RVing customers who have a different service at home.
In some cases, prepay is the only way a customer can get DISH Network, much like a Cricket phone for customers wanting a cell. The point is not to place them in a category, but give them a feasible opportunity to have service and control their monthly bill more easily. It helps them not get further, and allows DISH to serve their needs as well.
Before a divorce years ago, I had prepay phone, internet, and television service. I was looking to buy a house and the mortgage company I had inquired about a loan through mentioned the number of credit inquiries on my credit report actually hurt my score (or recommendation for the loan?). Being that my credit has always been only marginal, I had to keep inquiries off and get my debt to income down. Not having nutty random charges on my phone, TV or internet for overages or order, I was actually able to improve my credit dramatically over two years.
DHA/DHA24 are post pay accounts, basically being able to be billed for certain things at a later time, even though it is technically still paying for the next month of service up front. DHA is no commitment and DHA24 is the two year. Premium? I haven't seen one. Some people, even though they qualify for this, refuse it and choose to go with a prepay service.
I know its outdated. I said in my first post that it was dated from June 2010.
Which is likely why it shouldn't have been posted.

It added more questions that cannot be answered. It can also lead to people being upset over things that have no bearing at all. Also wanted to bring notice to the fact that every page does say
Confidential Property of DISH Network. I would personally feel better if it would go away.
Could our DIRT members comment on some of the things I've listed.
Unfortunately not. I seriously hope you understand that while we like the patrons at SatelliteGuys, we love our income from DISH. Since things change so often, even if we were able to answer the question today, to remain correct it may have to be changed tomorrow. This is part of the reason why internal documents should stay internal.
Some of the best questions are the ones that have no answer, though. So good question.