Violet not wife....
I assume this has been discussed but I can't find it. Sure, I see the levity in paying her only $50 for winning the bet on who kills who if she was his wife (at least in a community property state), but I believe he was "paying for her" as well. Which is why he got off on her sleeping with someone else. I assume she had a background in this type of work and that is how they met and it just took off from there. Plus, no offense to those named Violet, but it is a commonly used alter ego for those in the trade.
But damn, she was smoking in this film.....