The Xoom hasn't launched outside the USA yet...I'd put that fact as #1. I've been waiting for a Canadian release for months and it still isn't here. What a bummer, I really want to own one. It's only available to 4.5% of the world's population so it's no wonder nobody's buying it. Only rich Americans are even given the opportunity to buy it. That's why its sales are low.
Do you have a passport and a car? The WiFi version is available at stores throughout the U.S.
You don't need a passport or a car. Just use a package forwarding service. Check out http://bit.ly/gN2oGK