Total Pie in the sky here, just thinking out loud.
So, this tournament would occur in two phases.
1) The list building phase. This would be an interactive "pregame" that would finish up a week or so before any games were played. More details below.
2) The game playing phase. Everyone meets up on a Saturday and plays in a 3 game tournament. From this point forward, it's pretty much a normal tournament, using the lists that were built in phase 1.
So, about the interesting part, phase 1:
Some folks complain about the lack of internal and external balance in codices these days. And it's not hard to see why, with Tau and Eldar monopolizing the top tables everywhere. It actually seems like balance is more out of whack now than it ever has been.
So what if we let the free market correct the balance issues?
Make a finite number of each unit available to be played in the tournament. Let's say, 6 of each troop, 6 of each dedicated transport, 3 of each other unit in the codex (and maybe only 1 of each special character?) The available units must be bid on, with points, in order to grab that unit for your army. Bidding starts at 20% below the codex price for a unit.
So, if you're the ONLY person bringing an army (like sisters of battle), you have no competition and can get whatever stuff you want for a bargain.
However, if you want to play a popular army with a universally spammed unit (say, Eldar with Wave Serpents), you're going to end up paying an increased price for that unit. The price of the unit will go up exactly as much as the market will bear. You might have 3 or 5 people bidding for only 6 wave serpents.
Allow people to switch armies at any time, which automatically retracts any auctions that they are currently winning.
Pros:
- This plan would directly incentivize people to play with "unusual" armies and units.
- Rewards creativity. If you can think of a good way to use a unit that nobody else wants, you get a huge advantage.
- Invalidates all forms of whining about imbalance.
- The list building phase would just be barrels and barrels of fun. Maybe almost as fun as the game playing phase. What's everyone's favorite part of a magic draft? The actual draft. What's everyone's favorite part of fantasy sports? Also the draft.
Cons:
- Lots of bookkeeping. Probably impossible without a well done web program to keep track of it all.
- Might be too weird for folks / hard to understand.
- Lots of gotchas you'd probably have to discover as time goes by and tweak...