Thanks, OldTrader, for your clear examples and well-reasoned conclusion.
Quote from OldTrader:
Really this involves two separate questions:
1) What intraday margin does IB need to protect itself
2) What intraday margin does the customer need to protect himself.
...
So I think the answer here is that IB is requiring more intraday margin for many of these contracts than is necessary for their protection. On the other hand, given the volatility no responsible trader needs more. So, to my way of thinking, this is almost a moot question. IB asking for more than they need, but the trader should be trading with more anyway...probably more than IB asks for.
OldTrader
