they would still lose out over the long run as they would receive a lower amount of payouts.
If your mining operation is a block eruptor.... you have nothing to lose.
A "lower amount of payouts" from nearly zero, is hardly distinguishable from nearly zero. Many of the pools have a mechanism such as pay per share, so the withholder doesn't lose any payouts even if the pool is strangely 'unlucky'.
They're paid just by "proving" they are working on the solution.
Without an extra kickback for providing the solution when they find it, however... the pool operator, and the majority of the miners need the solution to be found early a LOT more than the individual miner does.