Gold and Robet K

Mannn I found an article that Robert wrote Im going to guess in 2002.

http://reiclub.com/articles/bad-news-good-news

He must be really raking in the dough off the gold market! LOOK!

http://quotes.ino.com/chart/?s=FOREX_XAUUSDO&v=dmax

I think (and this will probably make me look stupid) but I think hes getting a %33 roi. maybe my math is flawed...invests at 300 goes up to 400 so $100 increase is %33 of $300 but over a 2 year span thats %17 a year. I kinda think Id want something more rapid than that more like 30-40%/yr...but maybe with gold it just doesnt work like that..bottom line..im not too educated on futures markets as to what would be considered a good return and what would be considered marginal...any knowledge from others as to what that would be would be helpful.