Maybe because people don't think of stock investing as a business (I'm talking about the typical Robinhood trader, not people here).  How many people keep a journal of their trades for the year like they keep track of inventory as if they are running a store, or how many people think of paying for BPT just as they would have a line item for professional services or R&D as in a normal business.  If they attached the BPT subscription as an overhead cost to their trading P&L then that dynamic may change.

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