Pretty much every mixed league I've been in has done a 50/50 with each team (by team number) having a week or two to sell them throughout the season.
I don't see the harm in it as it pays for added things like a christmas party, thanksgiving party, etc.
And in a league where everyone has to sell tickets, I really hate the argument that "Well, not everyone buys the tickets, and then they collect at the end." Here's the thing, they aren't getting the added monies for BUYING tickets. BUYING tickets get you a chance at winning half of the money collected THAT NIGHT. You get the added monies at the end because you sold the tickets just like everyone else.
My league averages giving back 13-14 bucks per person at the end of the league. For not even an hour of my time, one week of the season, that's not bad.
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First one to leave 15 ten pins wins!