I think it also comes down to your contract.

My husband and I were both employed on single contracts before arriving here. In the meantime, we got married and on arrival the company changed our contracts to "Married" status and we were no longer able to receive separate benefits. We would have been better off financially on "single" status, but our contracts clearly stated that we were not entitled to receive 2 lots of benefits as a married couple.

We wanted our jobs a lot more than a few extra bucks, so it didn't bother us. So I guess it depends on your contract, how much the difference is in the beneifts and how much you want your job!