Obs,
Captains rarely take home 5K a month, I know!!! In fact you should know as you're profiled as a Captain. So an F/O can? Who?
Of course UK airlines don't have to pay an accomodation allowance for UK pilots to live in the UK... EK have to provide accomodation or the allowance for expatriot pilots to move to the Middle East in the first place... I just don't accept your argument that it is part of the 'pay' or part of your disposable income rather than it is a prerequisite of the 'Ts & Cs'.
You are misrepresenting the situation with simplistic figures from the vantage point of a Captain that virtually no F/O on the line can acheive. Simple... it is not.