Along with yesterday's idea with the doubling amounts, here's one for keeping score of the proveout.
When a player deals, the proveout offers, and the contents of the box that the player would have had (if would have swapped, the swapped amount), would be added together, and divided by how many stages there are.
So in Pottsy's game, he dealt for £9,000 at 8-box.
At 5-box, the offer would have been £17,500, and 2-box was £20,000. The amount he would have had won in the box was £3,000.
Added together, the total is £40,500, and divided by 3, comes to £13,500.
So in this example, the banker wins. Technically, it's £13,500 to the banker, vs £9,000 to the player, or 60% to 40%.
If there was a minimum amount on a board, say £15,000, then perhaps all of the above would be subtracted by £15,000, to make the percentage stat accurate.
The benefit of this method, is that it looks at the proveout overall, than on a single specific offer that the player could have had.
Overall good idea

, or technically bad idea

, or maybe a draw

.