The points raised are very valid, averaging down any company by any method has not been a good strategy, except on the companies that are near current highs. I hope you have heard of survivorship bias.
A better question would be, Where is your uncle point?? Where do you bail if it doesn't work on a particular stock?? Can you stop the damage from being catastrophic to your trading if OZL came out with a market statement that they had just lent 2 billion dollars (half loaned) to a minor subsidiary (10% holding) that is run by Skase, Bond and Spalvins??
So you spend $160 per month on brokerage to 'save' $85. You don't see a problem here do you??
brty