WTH Why is it not possible to add a second HA instance to Nabu Casa Cloud

Month of "What the heck?!"
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1

I think this is in the gray area of “Month of WTH”, but why is it not possible to add a second HA instance to your own Nabu Casa account?
For a small (only server cost covering) extra amount, this would surely be convenient for many users. But another US$7.74/month just to maintain my mother’s HA instance, for example, is way to expensive for me (especially in these challenging times).

2

I, personally, would be willing to pay for another full amount for a second (or more) HA instance added to my account but having them together would be useful.
Use case for me is similar to @nicohirsch where I created a ‘security’ system using HA for my parent’s house. They pay for it but it would have been nice to have the option to add to my NabuCasa account if I start to pay it for them.

I’ve also see people mention that they have a cabin/shed/RV/business/etc a second location they run a HA instance in that would be nice to have in the same Nabu Casa account.