Quote from theTaoTrader:
That's the reason. "they don't want non registered traders from attempting to be pseudo mkt makers." It does cost ISE in terms of increased network traffic, which is huge for an option trading platform.
In less enlightened times, people would say "How dare the SOES bandits try to enter a NASDAQ stock between a market-maker's bid and ask. Then the bandits demand that their bid or ask be reflected in the stock's quote." Now it's abundantly clear that the market-makers were the Evil Empire and the SOES traders the Jedi.
Any discouragement of liquidity is a battle which apparently needs to be fought over and over again - even amongst fellow traders who apparently take the side of the institutions!
