Fake killing lags too much and you're going to have a stuffload of physics bricks all over the place eating up your framerate. You're not meant to have bricks fake killed for a long period of time. If you set a minigame with fake killed timeout for the longest possible time the server starts to lag.
Also with fake killing bricks you'll end up having a stuffload of floating bricks as an end result from the fire while with regular killing there will be no floating bricks.
Poll