The current license isn't representative of real world prices.
I won't comment this as this is pure marketing stuff that has to be discussed between Zentyal and customers but, from my viewpoint, not between customers.
Hardware is really cheap and partitioning services across a few servers makes a network much more robust.
I do agree but don't understand why you don't rather go this way if it brings robustness you need (and trust me I fully share your comment
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There isn't even a domain price. Its just too monolithic and for many hard to justify the cost.
Again, this is marketing stuff. I can't comment. My feeling is that maintaining, at Zentyal side, different costs for different configuration will just be a nightmare. Then, as OpenSource is quite often understood as "freeware" by our managers, I do agree that justifying cost when one suggest open-source based solution is quite, not to say very, difficult.
Of course, you know that achieving almost same level of feature can be done installing your own components, for free
This will however not get rid of administrative overhead and will take more of your time in term of support and maintenance. There is also a cost for this