my experience was that, economically, married vs. single-but-cohabitating was about the same... until we bought a house. our mortgage is more than double what we paid in rent before, therefore much less cash floating around. of course, now that it is so common (and easy) for two non-married employed people to purchase a house together, this issue will likely spread to the non-married.
one thing that neither article mentioned was the international marriage phenomenon. the thing that finally tipped the balance for us to tie the knot wasn't economic, or moral, or family/societal approval, but simply that it radically simplified obtaining my wife's green card. we'd already been living together for several year at that point, so it wasn't really a traumatic decision. as our society becomes much more mobile, this has become more common - I personally know seven couples who have gotten married primarily to simplify the immigration process. i'm not speaking here about fraudulent marriages, rather about committed couples in legitimate relationships who would not otherwise have felt compelled to get hitched if it weren't for hassles with the INS.
I see no diffrence inthis than people getting married to simplify insurance forms.... baking.... you name it. I am not saying it is right or wrong.. just commen