Quoted from PinballAir:If I put a game in the game room before it is restored, it never gets restored.
I like restoring them first. The "I can't wait to play it when it's done!" thing is a great motivator to complete the restoration. Then after a while if you don't particularly care for the game you've got a fully restored game to sell that's had all of the tweaks done to it to make it 100%.
-Paul