Tristan, you are the voice of reason it seems. I will try to refrain from going out too deep but I feel a need to comment on at least one thing:
I'm not going to use the curse button for this, but I never *never* want to see the F-word on RoE, especially in sentences directed somewhat towards other players. This is my retreat from the idiots who inhabit my daily life and who use that word more than enough. I'd prefer not to read it in here as well. I simply believe we are too mature for that.
As always when writing forum posts, remember that we cannot see you smiling, we do not necessarily know what kind of mood you are in, so chances are someone will misinterpret your carefully constructed joke. Especially if its someone you haven't had that many dealings with IC and/or OOC.
/rant
I agree with Rune and Tristan. I have no issue with the cost as it stands for Nobles - Heck, Aubrae has two provinces herself in Avanil, the rest is controlled by her bannermen - but it does seem a bit strange to me when it comes to temples. If I, as a noble, invest part of my domain to a vassal, I can expect his son or heir to pick up the slack should someone off him. I am investing a man and his family with power.
Temples do not work like that, instead electing new Archbishops or whatnot to fill out a role when an old one dies. And considering most high-ranking priests are somewhat old that could in an extreme case mean that a large temple have to designate several new "heir's" instead of just one.
If the cost is to remain, perhaps it could be possible to transfer a bit of RP into the action each turn, with complete designation to take place after the last RP is pooled together? I suggest this, because I know from myself how much my RP/GB pools resemble my own wallet if I am not careful: If there's anything in it, chances are they'll burn a hole straight through.
And if that is possible, then, at the DM's discretion, it might be possible that lands choice might lean towards someone who is, at the very least, partially invested already?