Get it in writing. Have them e-mail or snail-mail the specific reasons to limit your trading activities.
Keep in mind that a discount broker probably doesn't want the hassle of brokering a grey sheet stock in any quantity. It's gotta be a PIA.
Occam's razor:"the simplest explanation or strategy tends to be the best one" Hanlon's Razor:"Never attribute to malice that which can be adequately explained by stupidity"
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