I always reckoned the ONLY people who should have ever got home to duty costs were those that the RAF forced to live in a married quarter some distance away from camp. If you chose to live that far away or bought your own house through choice then you should have to pay your own transport costs to and from place of duty, exactly the same as any other "normal" person going to/from work.
I claimed it because I could, but had the rules changed I wouldn't have batted an eyelid as it was my choice to live 14 miles from work. I upset a lot of people (all married and living far from camp, strangely enough) with this belief over the years.