$8050 is about 6.25% of the notional value. But the IB Maintenance margin requirement ($6442) is 5% of notional. Which is the same as the CME Overnight Price Limit Down level (5%).
Can you imagine what the rates will be when volatility picks up. These rates are much higher than most futures brokers. Volatility in the index futures is at historical lows now.
Yes, that is what the exchange minimums are. The broker is not tacking on any extra according to that listing.
You're right, but Interactive Brokers ain't what it used to be. There's no longer any place at IB for a knowledgeable futures trader; hasn't been for a long time now.