Morning Brain Fart Question on VIX Puts Margin

Ok, to keep it simple, if I short 1 put with a strike of 17, the most I can lose is $170, right? (Minus premium collected.) If so, why is IB telling me in its little Margin requirements per contracts box that my margin is 601.74 (initial) and 553.40 (maintenance). Vix options have a multiplier of 10 (not the usual 100), right?

Somebody, wake me up.
 
Off hand, know what the account minimum is to write naked ES OTM calls? It's SPAN, I know. But I heard something about $25K minimum.
 
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