In most situations when I've came across married people assessed as single individuals, the couple were seperated (especially before divorce was leagalised). Their reason for choosing seperate treatment was simple - why give their credits/allowances to their ex or allow their ex to have knowledge of their current circumstances, especially if their ex was a person they may not have had contact with for years or a person they hate.
Also, not everybody is logical and reasoned and don't care if they may be missing out, they want seperate treatment and that's that!
Also, not everybody is logical and reasoned and don't care if they may be missing out, they want seperate treatment and that's that!