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Idea for getting rich using computers to track stocks
The main reason I'm aware of that very few individuals do this sort of trading is that you're not taking into account the transaction costs, which can and will be considerable for a small-time investor. Say your transaction costs you $12, that means in order to come out ahead you'll have to have a fairly large position in a given instrument to make that fee back and some money. Most smaller investors wouldn't really want to tie up 5-6 figures for a day on the chance that you'll get $100 back. The economics change for investment firms, especially market makers that get special low fees for being a market maker (ie, offering liquidity by quoting all the time).