If you are using proper risk management, say risking 2% per trade, it should not matter if you are trading 200 shares vs 10,000 shares. Your risk whether the trade works out is the same.
It's true I shouldn't and cant assume but based on his message. I'd be willing to bet he understands this and that it's more of a mental thing, not a logical thing. Just like it isn't logical to drink and drive and you could explain that to someone, doesn't mean they won't drink and drive.
