Surprisingly many. Error-free execution of complex orders under conditions of human stress, when most true opportunities occur. The synergy of the entire traders rulebook analyzed in real time and kept into the future, irrespective of the quality of human memory.. Scaleability over many independent sources of risk which aids diversification and prevents overtrading. The ability to turn off the charts and other scaremongering commission-generating aids. Ruthless discipline, no emotional baggage, including no fear of going against the consensus opinion and no greed that prevents humans from entering and exiting 'too early'. Better ergonomics, tailor-made customization to your needs, an immediate reaction to bug reports and freedom from constant unwanted software changes (if you are with IB, think the exact opposite of their customer support, where they want *you* to changeQuote from indexer:Plus, what advantage would a computer have [in longer time frames]

There are some 'soft' arguments too. Infinite patience in waiting for the opportunity to present itself, making you into a really tough negotiator. No need to force low-probability trades during periods of low volatility, caused by the innate human fear of the flat equity curve. No feeling of being unemployed when you have made no trades. After all - you have turned Her on
and you haven't been watching the screens all day in vain, so maybe you even did something intrinsically rewarding and have no regrets for the unproductive day. Also the rare opportunity to challenge yourself while developing your applications and thus enter the state of 'flow' - probably the only moment of true happiness in this remarkably mean occupation.. apart from writing for ET of course