We are in agreement here.A margin account is required only if you write options... because in theory your risk is unlimited. Even if its a multi-leg strategy with limited risk. Purchases of puts/calls however come directly from, and are limited to, the cash side of your account.
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I assume thats basically because with an option you can lose 100%, whereas with stocks they can define a reasonable margin risk.
I was referring to writing naked options. You won't be losing $300,000 in your margins account if you only long options.
