As typical, your post made sense and helped clarified things for me.No. Arbitrage is a relationship that is easy to lock in and collapse. It is rare and between stuff like violations of put/call parity and yes, it will be very quickly captured by electronica market makers.
Instead, this is about the market price of risk. Implied volatility (which dictates the price for straddles) is not any different then any other risk premium in the market and there will be some equilibrium in MMs trying to figure out what it is really worth. That price is composed of two components - (a) the actual expectation of volatility and (b) the risk-tolerance of the market participants to a position.
You are thinking about this all wrong. A small retail trader has a number of qualitative edges that put him in a unique position to make money - you are small, you are not subject to regulatory bullshit, you are not mandated to trade a specific asset class etc. As they say "I'll let the reader fill in the blanks".
PS. Ashok, I have to say that http://www.key2options.com/ looks like a waste of money to me
Thank you for the coaching.

I'll take a beer if you are even in the NYC, but otherwise my 2 basis points are free