This argument seems to be fairly well polarised.
Either you are in the camp that says you shouldn't be financially disadvantaged by taking up an appointment overseas because:
1. It's retention negative.
2. It dissuades the correct characters from going on the tour.
3. It's fundementally unfair, we don't get paid by how good a tour it is. e.g. Leuchars, great base by a golf course, get paid 90%. Marham, middle of nowhere, get paid 102%. Chivenor amazing, 80% etc etc.
Or you are in the camp that says that it was a) a good deal and b) voluntary so you should just be grateful. Which is a pretty simplistic, petty argument worthy of those whose thought process is limited to 'just because'.