If you want to constantly increase output it's obviously impossible. That is just bad gamification. I think gamification has to be progress toward completion,

If you want to constantly increase output it's obviously impossible. That is just bad gamification. I think gamification has to be progress toward completion, and the difficulty of completion has to be set deliberately so it isn't either easy or daunting. So every 1000 tickets you get a day PTO. More like that. Tickets aren't good metrics, it means prioritizing easy tickets and incentivizing creating more tickets than necessary. There are no good metrics for software work really.