Sphere Break Gil Trick

Make money easily, you can start in chapter 2

http://faqs.ign.com/articles/442/442330p1.html

Still doesn't beat the much more uber way of rubber-band tying down the X button and the control stick to upper-left, with an Alchemist and two characters with Mug and Pilfer Attack...

A good alternative for those who enjoy the minigame (or the game in general). Pretty nice find.

Personally, I'm fond of using O'aka after you've paid off his depts and before he leaves the airship. I can rack up a ton of gil in a very short time, but I don't really spend it since most of the good stuff can only be found, not bought...

Ghost may have seen one of my cheap tricks

I assure you, Ghost probably did not, and he already knew that you can use the O'aka tricks. It was published before the strategy guide was even published, and the trick is even listed in the guide.