Think Before You Transfer AMEX points for Etihad 20% bonus

I think this may be very obvious but just in case, some people may be tempted by Etihad Airways' offer to give a 20% bonus on any transfer of American Express Membership Rewards points to Etihad Airways points. I know many people have heard of Etihad from things like Etihad Stadium etc around Australia but it may be worth noting for Perth residents that Eithad doesn't actually fly from Perth! So before you chase this 20% bonus, you might want to think about whether you will ever get to redeem your points for a flight.