****I just don't believe that any brokerage house is going to sell their stock to knock the price down*****

Chief. With all do respect. You know better than that. I have a few brokerage buds who do it all the time. They will do this esp on low volume days by using what is called iceberg order keyed into their computers by selling say $100 lots to work the price down. Nervous investors "see" this and start panic selling some or all of their shares moving price down. This is where the Broker...usually "Anonymous" will move in.

When they want to buy they will also buy inl small lots so as not to let the price rise too quickly.

We have seen it happen here with ZEN just recently and it will happen again baring news. Its called M & M's.  Wait for it again. Great buying op don't ya know.