Well TBH i don't see marriage as a means to make money fast, but to get my hands on some gear.
-good gear barely ever spawns
-good gear can barely be looted from battles
-good gear in stores is ridiculously expensive
So, all I see in the wife is a good armor and a nice helmet and horse barding
Sure, I could sell it, but then I have a bunch of money to buy what? A legionary mail for 300k?
Furthermore you can only do it once (until your spouse dies)