The larger brokerages such as Scottcrap and Ameriturd have been using this ploy to allow online sells only all over the pinks and otcs recently. I have called Scottcrud numerous times and they give a standard answer that the security was identified as having suspicious trading activity and therefore placed on the call-in only buy list. They are more than happy to allow positions to be closed, however. I have seen one stock, GLKC, still fly after several brokerages decided to lock down buying. The more recent examples I have owned all have been negatively impacted. It is still unclear why the brokerages are actually pulling this move, but a Scotturd rep told me during a phone call that it was a recent change in policy and that they expected to see it employed more often. As far as BCIT goes, there is an obvious story of below board trading activity behind it, however, locking it down was, in the opinion of most, was not the fair way of addressing the issues.
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