Originally Posted by Efrem
Unless I misread everything here, David4455 is not being asked to lead the trip, guide it or anything of the sort. He and his partner are being asked to lend their names to the promotional efforts, and as part of that to approve the itinerary (presumably it is of some marketing value to say that they have vetted it) and to participate in the tour (again, presumably for the marketing value of participants being able to rub shoulders with them for a while). This is fundamental to what they should ask for. Suggestions based on their working as guides are, pardon the expression, misguided.
So you think this sounds like a vacation? If he isn't asked to lead the tour, he shouldn't be paid for leading it.
But the two of them should be paid for the amount of time they spend with these people during the day and night. Their presence is a marketable value for all of those hours of being with perfect strangers. These hours should be paid for quite handsomely especially since this travel agency is a high-end company and probably charges substantial fees. If his presence is meant to be a co-leader as opposed to being silent, MUCH MORE MONEY should be on the table. Before the OP accepts, he should find out precisely, in an itemized list, what the agency expects him to do. Then charge for his services like a lawyer would charge for her hourly billing.