I gathered that fat finger trade [just my interpretation] was rubbed out but far less than $100 appears to be used to manipulate the market. I have seen many small penny stocks have heavy selling all day and then a day ending buy of a dollar or so at the end of the day that sets the price until the market opens the next day. This can go on for an extended period of time.
The most obvious suspect is an MM or computer trader that need pay no commission.
How effective are these strategies?
The answer would seem to be in how common they appear to occur.
For those not actively trading, I consider the matter a minor nuisance.
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