50 BTC @ 15% below current price
70 BTC @ 20 % below current price
90 BTC @ 25 % below current price
etc.
At some point they'll be hit (or not).
If they're hit, chances are the price will go up in the next several days.
Sell when the price exceeds your price by some small amount e.g. 5% (which isn't a bad return in the real world). If the price continues down, your ladders will be hit, lowering your average price.
If your orders aren't hit. No problem. Cancel and start over.
This has worked consistently for me so far.
IMHO, it's low stress and you don't have to watch the market at all. Set alarms for each of your order prices in Bitcoin Ticker on the iPhone, or one of the other BTC price apps that support alarms. With this method, you don't have to bother with charts, technical analysis, etc. It does require patience though and might not result in high returns that other methods promise.
Thoughts?
Sounds a lot like http://en.wikipedia.org/wiki/Martingale_%28betting_system%29
Yes, just like the martingale method, your method will work 9 times out of 10, hence the consistency you observe. But, that single 10% loser will be really big, wiping out any profit, on average.
This method's a way of making your profits look consistent when they really aren't, by taking increasingly riskier bets.