I always thought margin was a privilege and not a right. The CME requirements are sort of a 'minimum' and brokers can apply house rules. Sort of like a speed limit. Just because it says max 60, it doesn't mean you should go 60 during freezing rain/black ice and running summer tires.
Keeping someone as a customer is a privilege, not a right. Just because a broker can adjust margins arbitrarily doesn't mean they should and it won't impact their business.
When will this guy shut his piehole about IB. Goodness. He claims he found a new broker but talks about nothing else than bitching about IB. Outright pathetic.
So they can grease the shit out of their customers? Fleece them to make them close positions so they get commish? Who knows. Current ES margin as per CME is $4,750 per contract. Add 10% if yer a speculator to meet initial, and your max is $5,225 per contract.
If you are an IB customer simply pick up the phone or click to online chat and ask them. If not why do you care?