Poker is just one game where simple elements engender deep complexity. It doesn't have to be XP, we can leave that well alone.

To give another example: let's say anyone casting a vote can also submit a number (\d+). A purely optional choice, zero by default means to ignore it. One or two of the smallest unique bids are the winners and will go on to perform an action. The action is just a CSS selector: node highlight for +rep, comic sans for -rep?

The idea is not to arbitrarily gamify everything, it is to provide depth where there is room for contention. One may need to spend a little thought to effect their verdict. The hope is that intelligence might win.

Edit. It suddenly occurred to me that use of the word "intelligence" might have upset someone. Refer back to the previous sentence please: in order to play, one would need two resources: (1) a vote, the price of admission; (2) "a little thought"; meaning a barrier to unthinking participation. That is all. It's just a lottery anyway. Also, let it be noted that the example as such would not work. Too... fidgety, too obscure. But it could serve as a basis. (And if you don't like lottery, maybe some other game. Remember, voting is a game too with its own rules, moves to play, victory conditions.)