I find it interesting how you use the term "life long partner" in the message but "wife partner" in the title.
Make me wonder whether you are thinking of a "love" match or a "convenience arrangement" ?
I know of a number of convenience arrangements, some involving the thought of love but most not. A number involve the exchange of $$'s on a regular basis as well.
Do they work ? Depends upon the individuals involved and what their aims (both short and long term) are.
There are many threads here which if you browse thru the titles going back, you'll find plenty of previous discussions.