Here's some bookmarklets to automate the very simplest strategies. Unfortunately I don't think there's an easy way to automate this guy's strategy though.
The real questions are, "How long does this take in real time?" and, "How much like real life is this scenario?"
The default setting has trades of 20-day duration. 18 trades take one year, and to get to ten years takes ~183 trades. At 3.5% inflation, $141 large turns into $100 large in ten years.
What the site really needs, in addition to the glamorous dollar amount, is an effective annual percentage rate (Instantaneous/Cumulative/Moving average would all be nice to see) of your investing strategy. That way, you could see the unglamorous effects of trying to beat inflation while crawling out of the hole you just dug yourself.
For example, I picked only apparent winners that had climbing moving averages for the last six months, climbing value for at least the last three, no major price shocks in the last six, and I held for 20 days. After 43 months I had $187,000. The value of this money was a little over $160,000 after discounting for inflation (%3.5 annually, as a guess). Approximately 14% per annum after inflation (and before taxes). This same strategy, unmonitored for time, yielded $15,000,000 earlier. Fiddling with logarithms gives me just under 17 years to attain this value (not adjusted for inflation, and you have to defer your taxes).
If it really is this easy, we should all be eating Ramen and working for Microsoft for $100,000 per year. After two years, you'd have your seed money, and could go work fast food to pay the rent while you pay attention to the stock market once every 20 days.
Am I the only one to whom this sounds a little odd? Could this just be that the data are taken "at random" from a bull market? Is it just that you can't find the proper 17 years in which to do this? Are all my wins coming from the bull markets? That is, am I (by choosing stocks that look great) actually choosing stocks from a bull market? Wouldn't this imply something about the feasibility of actually earning a living this way?
Buy only:
Sell only: Random: Of course, these are all pretty awful strategies...