Odd seeing you here PGP_Protector, along with Bill from AZ LOL !
I was asking sales about add on domains and if they are only considered as sub domains. The answer I got back (AND pretty darn quick too!) was that all domains are considered equal. Glen said, " You can host as many domains as you'd like under a single hosting plan. We don't limit the number of domains you can add-on. With our system all domains have equal weight, so you can have as many domains or sub-domains as yo'd like under a single plan."
So, I would guess that what he is saying is, since you are given a generous ability to have multiple domains under say one users acount.. say vernsdidj as an account name, then there is no need to keep track of separate record for multiple domains and have them spread out. It would look like one person/corporation/entity creating multiple accounts would be more burdensome for the keeping track of records and billing, support, etc. Whereas one account name would basically be one very large space to add in other domains and host them here.
In my computer, all my programs reside under one folder on the c drive called "Program Files" and in there, under each sub folder is the actual program content with all it's appropriate supportive files and folders. I can have virtually an unlimited number of sub folders under "Program Files", only limited by disc space.
Now taking that to the web idea, here we have one account with one public_html folder and under or in that are all these different sub folders of hosted domains. All coming under one account. At least that is the way I see it. And, as others have pointed out, above, I'm new here also with 1 post at this point, so I may not have all the ducks in a row, but I think I'm close.
http://vernsdidj.com didgeridoo info and more