Not sure how it goes in your flight, but in mine, the point of a dom bank is to provide funds for dom efforts, so that you don't have to rely on wealthy individuals doing everything for the week. No matter how much people hate it, "dom efforts" is going to necessarily include buying mercs if you want to win. I have no idea where you're getting this notion that it somehow costs less when individuals are the ones buying, but it doesn't track, and I'm baffled that you seem to think it's fair to cover other dom efforts that cost money, but just leave people to their own devices when it comes to this one.