My point being daytrading (if it's systematic) is better to be mechanical; therefore automated rather than manual (which is what davidd seem to dabble in)

Also, often there's a scalability issue with day trading strategies. Making 500K  a year is fine. But the amount is all relative. If someone has 100M, most likely he's not looking to make 500K a year. And the daytrading strategies is probably not so profitable anymore. If many bloggers here dun trade large amount , that's fine. But if one trade real decent amount in these markets, then one shld think harder on how much time to spend on what.

Another thing, the best traders in the world are most likely not day traders. The odds are unlikely to be in their favor.