More interesting is why the purchase orders at usually at >=$1.0, and then there are sale orders at =<$0.999. Why someone would automate something to lose money so consistently? I guess this is what the author was calling out, not the numbers per-se. The numbers just point that the buy/sell are the same entity, human or not is irrelevant for the number. But the behaviour is the odd part.
Yeah, even if this is code vs. human, it's just as easy for the code to round or vary the amounts.