Runescape :: how do you make money & how much do you have?

I have a little over 100m in items and 10m in cash. I have been playing off and on since 2005, (right now I'm taking a break for a few years) so it just kind of aculated. However I did make most of it back in 2008, by killing LOTS (over 2,000) of green dragons in the wilderness and chopping yews. I don't know if the green dragon method is any good now since the wilderness update though... You could try killing black dragons if your range level is 70+.