Thailand isn't the only example; I think many people originate their RTWs in CAI, I believe RTW fares are significantly cheaper from Cairo than even BKK. Maybe someone could verify this.

Also, take the example on the MR forum that's been kicked around for a while now... you can buy an OZ (Asiana) return business class ticket from CMB (Colombo, Sri Lanka) to LAX or SFO for under $2000, sometimes closer to $1000. Too lazy to post the link, but it's referenced in the sticky Mileage Run Tools thread at the top of the forum.