Other pluses of RTW:
1) You can change date of travel without penalty;
2) You can change routing for only $75.00 fee;
3) No fear whether you will/won't get that upgrade - you are guaranteed.
4) When flying on B/C RTW, you can upgrade AA flights with VIP's. I did LHR-LAX in First with Julie Andrews 2 seats away in July.
5) The Q-point and mileage bonuses are great, especially if you are EXP.
6) The RTW product really is good if you enjoy foreign travel. I usually go to New Zealand every year, so even to buy economy round-trip ticket probably would set me back close to $1,500 - $2,000.