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I'll often provide both sides when playing a game - so know the other figures will be painted.
I've done the same for the last thirty years, building and painting both sides for any project. That way you don't get Bob calling at the last minute to cry off, Bob, the bloke who was bringing all the artillery. it's paid great dividends in the fact I've never had the misfortune of having to attend a club!
This then limits my projects. It makes me far more immune to "new and shiny" purchases. If I see something that interests me I tend to have a decent conversation with myself: Is this worth $X00's, and is this worth hundreds of hours of painting/building/prepping, etc. My buddies know that if I do a game...I do a frikkin' game. This means I actually have a rather firm control over my lead pile. I have almost zero side "projects" that I bought on a whim.
Agree, I also like to paint both sides because this forces me to research both sides. I really dislike the chaps who tell you they will never game with Army X. I had a friend who refused to game eastern front with the Soviet, he only played Germans.
I feel like historical gaming mightn't have been the thing for that guy.