One way to look at it is to start with the basics:
A customer can have one or more Subscription. Think of the Subscription as a container that has certain limits.
These limits include disk space, number of databases, number of email accounts, how much space each email account mailbox can have.
You can define any number of pre-set Subscriptions each with their own set of limits. For example Gold, Silver and Bronze. Gold might have 100Mb of disk space, 100 mailboxes and so on, while Silver has 50Mb and 50 mailboxes, and Bronze might have 25Mb and 25 mailboxes (and so on and other limits too).
One more limit that a Subscription has is the number of domains that it allows the customer to have within that Subscription.
Typically you might only allow one domain within the Subscription. So if a customer wants to host more than one domain, they have to purchase another Subscription from you to contain it. That Subscription might be different from their first one (e.g. one Gold, one Silver) and therefore have different limits.
However, as an alternative, you can allow a Subsciption to support more than one domain, and therefore allow the customer to host more than one domain within a single Subscription. In this way you can sell a hosting product (Subscription) that, for example, has 100Mb of disk space. This is shared between all the domains the Subscription has been set to allow. Similarly, if you define a limit of, say, 10 mailboxes for the Subscription, these can be shared amongst all the domains allowed within the Subscription. So the customer can give each domain one one mailbox, or give one domain 10 mailboxes and none to any of the others - or anything inbetween.
The whole idea of Subscriptions is that if you make a change to a Subscription's definition, that change then applies to all the Subscriptions of the same type for all customers. For example, you might define a Gold subscription as having 100Mb of disk space. But then you want to increase the monthly price, and maybe you want to sweeten the deal to your customers, so you might tell them you are going to double the disk space at the same time. And to do this, all you have to do is change the Gold Subscription from 100Mb to 200Mb and all customers with Gold subscriptions will be updated -- with the exception of any Subscriptions you have manually customised - these are "locked" and do no change.
Typically, Webspaces are used by the panel admin. They are not associated with Subscriptions. They are a special class, free of any limits imposed by a Subscription. (they are actually treated as Custom subscriptions). The idea is that you can do what you want without worrying about any changes you make to Subscriptions or any limits imposed by Subscriptions.
Does this help at all? Please also don't assume I've not made any errors here! It is late, I'm tired, and I'm typing very quickly! Easy to get confused and make a mistake.
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