Russian men prefer living together (and thus getting all the advantages) without marriage.Economic and demographic situation is one of the most important reasons why Russian ladies become mail order brides.
They don't usually cheat (unlike Russian husbands), they don't have any alcohol problems and they don't beat their women.
That's exactly why Russian brides want to find husbands from western countries — to provide their future children with a high quality of education, medical care and life in general.
But of course, they won't relocate to the USA simply because they want a better life.
That's the very first reason why Russian ladies become mail order brides.
Another important thing is that men from western countries are looking for brides, which means they are focused on marriage and they are ready for it.