Piltdown man, you do talk some rubbish. For a start, the expats in the ME aren't using home nations' resources or services. If they're not, why should they pay home taxes? As it happens, many do continue voluntary payments to social systems like the NIC to continue payments to their pensions. As for their employers not paying taxes, the do pay education, housing and medical benefits, so that evens out.
Perhaps you should be looking a little closer to home, at the P2F, zero hour contract and other "atypical employment" schemes of low cost airlines, where these social contributions and taxes are often missing entirely, and who circumvent the law to avoid proper employment or union representation.