Prevailing research in market microstructure posits that liquidity providers bypass queue lines on exchanges by offering liquidity in dark venues with de minimis sub-penny price improvement, thus exploiting an exception to the penny quote rule. We show that (a) the SEC enforces the quote rule to prevent sub-penny queuejumping in dark pools unless trades are “pegged” to the NBBO midpoint and (b) the documented increase in dark trading due to investor queue-jumping stems from increased midpoint trading. Although encouraging pegged midpoint orders can subject traders to direct feed arbitrage, we estimate that less than 2% of shares traded per year present exploitable trading opportunities for this form of latency arbitrage, yielding annual gross potential profits of less than $20 million.