This represents a rather uncommon situation that has been debated a number of times in beta. My personal preference would be to have someone who already occupies a court office to be disinterested in any other post - regardless of stats and/or education - however there are some convincing arguments that can be made to not exclude them entirely.
I can see a couple possible alterations that might improve things:
First of all, I think that for "larger" rulers - those who have suibstantial demesne and fairly high base income - the scale of the amount being demanded is too high. In part this is an oversight at our end as we had incorrectly interpreted the exact net result of the scale values being used (this is true of any event that uses a scalable effect) so an effect of type = gold scale = 1 is presently demanding a vastly larger amount that was originally expected (i.e. intended). It's something that we should have picked up on in beta...and in fact we did. We simply didn't realise (until too late) just how great a degree this could take things out of whack. It has uet to be decided exactly how best to correct his for 1.04, the options being to rewrite the code that calculates the scale value or simply to reduce the scale values in all the events we have written. We will look at both and make a determination as to which is the better overall solution, but I think we can safely say that the amount of gold being demanded as a result of these events should be reduced rather significantly.
A second component of addressing this is to revisit the triggers and/or modifiers. As I stated above, my personal preference would be to employ trigger conditions to prevent an officer from demanding a different post, however I have ben convinced (to a degree) that this isn't necessarily a good idea. Accepting this argument (which you are free to do or not do, depending on your inclination) I would push for a set of mtth modifiers that significantly reduce the frequency of this event firing for a character who holds an office. This would satisfy the "it should be possible" camp while at the same time addressing the main source of your complaint - that it happened too often in too short a period of time.
The combination of these two should, IMO, resolve this and I will recommend that this be looked at quite closely as we conduct a thorough review of all existing events for 1.04.
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And on a slightly different note, may I suggest to Ilkhold that he remember that this board is an international one and that many of the members, more than half of the moderators, and the entire administration staff (not to mention the developers and owners of the board) are not native English speakers. As such, when you read a post that strikes you as inflamatory or insulting it is a good idea to re-read it very carefully and to consider that the intent of the poster might not be to critisize or annoy you. Similarly, when you post something - particularly a complaint - it is a very good practice to reread your message before you post it, to ensure that your own intent is not likely to be misinterpretted. If it is (or could be) then either rewrite it to remove this possibility or add in a few emoticons to convey your intent.