I keep blowing this rusty old horn, and to no real purpose since afaik no one has *ever* been bitten by the rtw rules, but when you fly an owe your contract with the airlines requires you to return to the point of origin, or an allowable alternative. The never-enforced potential consequences of not doing that are being charged point-to-point fares for the segments you did fly, retroactively. That wouldn't be a pretty picture. So, while admitting one more time that it doesn't seem to be a real risk, I think any newbie should be appropriately warned.