I always share. My wife has a nose that never misses the scent of $100 bills. Her standard toll seems to be 50% of "our" winning but no part of MY losses. That is her definition of "equal protection under the law".
After 35 years I find it cheaper to give her a portion for her "stash" than keeping it all for myself. First she can be a massive "cooler" if she thinks she has no interest. Second, since she retired 6 years ago, I found it cheaper to tell her "use your stash" than paying for each little project. Last year she paid for her trips with my sister to Spain and The Holy Land. Year before it was the new kitchen counter tops I had refused to get. I have put my foot down many times, but my sneakers don't seem to hurt as much as her stilettos.