I'm not exactly sure how this is supposed to work in the rules.
PCs get XP for treasure and Henchmen get 1/2 XP. Simple enough.
We have had occasions where some henchmen stay in one place, while others travel with the PCs. Sometimes those trips are specifically to go to larger markets to sell expensive loot, and thus earn treasure XP. In that case, I have given XP to the PCs and 1/2 XP for the Henchmen who joined them. The ones that didn't go don't get any.
Now the adventuring company is reaching appropriately large old-school party sizes: 6 PCs and 7 Henchmen, with probably a couple more to be hired soon. The PCs are now reaching the point where they want to go adventuring with some of the Henchmen, and send the other Henchmen off on journeys on the highways to do busy work - like going to larger markets to sell the party's loot for them.
Using the rule I've been using, the Henchmen should get all the XP for loot sold! Obviously, this isn't going to work.
How was this intended to work in the rules? Any suggestions about how I should handle this? TIA.