Windows 7: Upgrading Office 2010 Starter Edition

Just bought a new HP PC and it came with Office 2010 Starter Edition. Haven't actually used it yet, though.

I've been looking around to find out what the "upgrade" prices are to turn this into Office 2010 Home and Student -- and apparently, there aren't any.

If I understand it, the following is now the case:
1) Office 2010 Starter Edition is FREE
2) There is no "upgrade" price for other editions
3) Upgrading other editions involves paying the standard full-retail prices.

Have I got it right? Or have I missed something?

I don't recall there ever being upgrade versions of Office to go from one package to another. The only upgrades were to go from an older, previous version to another. That would make absolutely no business sense to offer a cheaper upgrade from a free product than the standard full version.

If you don't need any of the premium features, why not just use Office Live?