Salary agreements or 'Base Agreements' are determined on the basis of locality. Simply put, some paper pusher from an office somewhere will head off on a rekkie, determine the price of a pint of milk and a mars bar and work out your gross pay from that. Regardless of the fact that you chose to live in Tiblisi North or not is all a matter of fact, Ryanair will consider you as a resident at your place of work, however; unofficially, they know that you jumpseat across the network in order to spend a few days at home before 'doing it all again.' Any argument will be met with the age old proverb that 'your contract was negotiated directly between the company and your local base employee representative committee (tm).' You haven't a clue who this person or persons are and have a sneaking suspicion that the word 'negotiation' means something else entirely in Ryanairland.
All matter of opinion and very tongue in cheek. I could be wrong. 😀