It came to pass in the lands of Baron Garwyn the First that the peasants were greatly troubled by a plague of ankhegs and scorpions the size of cows, which did eat at their livestock and their kin. And they came to him, and spake, and did say, "Verily, we should not hesitate to pay our taxes, had we goats with which to pay them, but we haeve them not, for they are all devoured by insectes moste large." And the good Baron was troubled by this, and summoned the lady-knight Corinth to his court, whereupon they spoke at length of this matter. With the loss of the Baron to the duties of rulership, the mage Carcophan to injuries most grievous, and the mad Albanian to poison, the Company was much diminished from its former power, and Corinth was all that remained of the Olde Company. She had recruited many new members, but they were yet unblooded, and thirsty for plunder and glory, neither of which was to be had in the extermination of mere bugs, no matter their size. And these facts she laid before the Baron, and suggested that should he desire the infestation of his lands to come to an end, he should offer a handsome bounty upon those beasts which troubled him, in land or gold or titles, that she might convince her Company to pursue those ends.
And so we came upon a rules dilemma. In ACKS, you normally get 1 XP for each GP which you extract from the dungeon. The forums seem to indicate that this includes bounties, which have been suggested as a means for merciful judges (hah!) to provide extra XP / GP for hunting monsters with little treasure. This would suggest that Garwyn should be able to offer a bounty on monsters, and then his fellow PCs should receive XP up to any amount. Unfortunately, this could conceivably lead to situations like "Hey, you're 3kXP short of a level? Bring me the head of the Inconvenient Rat Which Haunts My Kitchen, and I shall give to ye 3000 pieces of gold!" So there's a problem there. You also get into issues with infinite chaining, where two PC regents each fulfill each other's bounties, and repeat ad nauseum for unlimited XP. Also not good.
My first proposed solution to this problem, which I still think is likely the best, follows from the principle that, in general, 1 XP can be earned from 1 GP by one person (or, 1 GP = 1 person*XP, for those of you who like physics). There are exceptions to this rule, as in building castles, but they're endpoints to the gold cycle, as it passed out of PC hands. So, says I, where can I find a source of gold for which the regent did not earn XP? Fortunately, ACKS has such a source readily available in the form of the campaign GP threshold, which is a confusing concept but useful here. The deal with the campaign GP threshold is that domain size and profit will, in general, scale with PC level, and so PCs should be able to achieve some sort of lower bound on earnings with basically no risk. This is the threshold; there's a table at the end of the campaign chapter which shows how it varies with level. When you earn campaign income, you subtract your threshold and then earn only the remainder as XP. For example, Garwyn's threshold is 5000 GP, so if he earns 7000 GP in a month from taxes, he only receives 2000 XP. The other 5000 GP have yielded no PC any XP, and so the rule follows - a regent can offer up to his campaign income threshold in GP per month as bounties which yield XP to his fellow PCs.
This system may work; I expect we'll see it in action soon. However, we reach another, alternate solution if we base our policy on another of ACKS' recurring principles - on average, 80% of XP comes from treasure. If we look at it this way, then we might suppose that a bounty of up to four times a monster's XP value would count towards XP for fellow PCs. This does nip the "Inconvenient Rat Problem" in the bud, but doesn't solve the possibility of powerful, high-level regents swapping bounties on mighty monsters and racking up thousands of extra XP on a daily basis. This too might be remedied by the policy that one only earns XP from a bounty issued by a regent higher-level than oneself.
In any case, this is still something of an open problem, but so far the monthly campaign threshold solution seems to be acceptable to all involved. Tomorrow, we see if it is inducement enough to fight the Insects of Unusual Size.