So, you believe that Shannon controllers will be instructed by their management to re-route eastbound traffic south for purely revenue reasons? Would you do something like that? Bloody sure I wouldn't. They may well re-route traffic for tactical reasons or to allow an aircraft to cut corners in the same way as we might stick MIMKU traffic through the IOM but isn't this the sort of service all ATC units should be providing?
Anyway, it is still early days and I suspect that all this sort of thing has to be sorted out. Ultimately, however, you can't deny aircraft a better service merely to ensure they fly through a certain bit of airspce (which most of them will still do in any case).