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I opened up BookTrader in IB for IYR Jan '12 $25 Call and it is showing a bid of 26.35 and a bid size of 0. How is this bid number determined when the bid size is 0? I placed a bid of 4 options at 23.50 and the book has not changed. Shouldn't my order appear in the book?

Yeah, spindr0 is clearly right here. I messed up the original. I knew it seemed off, which is why I asked :) Only thing I can't figure out is why IB wouldn't just give me the number instead of saying N/A. Has anyone else seen that?

I appreciate everyone's input on the trading strategy. I'm still interested in the answer to the original question to make sure I understand correctly the way that IB calculates margin even if you're not a fan of the example I picked :) What I mean is why is the commission and margin showing...

I want to understand when writing a naked put how much the price of the underlying would have to change in order to face a margin call. I use Interactive Brokers. Do they have any type of margin simulation where I would be able to see how much margin is required under different conditions...