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Why deep in the money options have very low liquidity
One reason might be the 100% margin requirement on long options.  Suppose I want to go long AAPL.   I could get a deep ITM call or buy shares. $12,700 for 100 shares, with it's 25% margin requirement is like around $3200 locked up cash.  Combine with a deep OTM Jan 2017 $70 strike put for $188, would give a $3400 margin requirement to enter the trade. or I could be in the JAN 2017 $70 strike for nearer $5800, but with a 100% margin requirement due to being a long call. So (3400/5800) = 59% increase in margin requirement for Deep ITM calls. Plus long term the shares will pay dividends, while a LEAP CALL does not.