I've been looking everywhere to see this technique mentioned elsewhere, but have yet to see it. At any rate, this is a variation on the quick save stock manipulation. I'm sure some of you are aware that the LCN stock market can follow a largely random trajectory up or down, usually balancing somewhere in the middle. The quick save, of course, let's you use that to your advantage by allowing you to immediately save when the stock you've invested has risen. If you repeat this process, loading when your stock goes down, this can lead to huge gains.

The kicker, of course, is that you can also use this process to bring a stock to ridiculously low levels. Take your lowest stock on LCN and try this process by only saving when it goes down. Once you've reached essentially rock bottom, put everything into it, and then do the reverse by manipulating the stock back up. Because the stock is at such low levels, it takes little time to raise its value, and by extension your money, by several hundred percent.

So for those of who can't benefit from Lester's missions late in the game or who want a potentially even bigger payout, this seems to be a pretty rock solid way to do it as far as I can see.