I see your point, but it might be a little extreme to say “be a fool to buy plywood from you.” Just because it doesn’t make sense for you and your situation does not mean that it would not make sense for anyone else.
For the reason I mentioned before, rather than me needing to go to a store, get it cut down and transported home, I would be willing to overpay slightly for the convenience of it arriving at my doorstep, assuming it is competitively priced.