Originally Posted by
AJLondon
<Raises hand like excited schoolboy>
Ma'am ma'am, I know the answer to this one, Ma'am.
It begins with P.
And it is
Pro·pri·e·tar·y!!
That's what the headmaster will say.

The exact cost of points seems to me to be something that is genuinely proprietary, unlike lists of what room categories are considered standard suites for the purposes of Plat upgrades.