I'm looking for further input and analysis from the community on this question!

Originallly we concieved of leagues as a mini-game that restarts from scratch each month, so any older bets were discounted.

But the idea of including profit on your entire portfolio (all shares that you own) is starting to grow on me!

Pros

• Simpler: League profit equivalent to your profit this month

• Long term bets will pay off at some point for leagues

• Fluctuations always have consequences: if you gain at one point, you will lose at another point

• Fixes the unintuitive case where selling out of a position at a profit leads to a loss if prices keeps trending in same direction
  

Cons

• Means a lot of your performance is determined from past bets, rather than specifically the work you put in this month. E.g. large positions from previous bets could ensure victory or doom you.

• Means the leagues computation is more complex in that it considers more bets. If you inspect a users' profit and loss, there could be like a thousand markets contributing to their profit. Technically, this is not so difficult. The UX might be a bit worse.

What do you think?