Fear I have been a bit slow to realise that:

If I send more than 5 parcels a week over an 8 week, and purchase labels via the MyPost site, I can for example send a parcel between capital cities for $7.30.

The volume qualification bar is probably to high for me, as I only send 10 parcels in a good month, to continue using eBay labels with no possibility of a discount and which I can't use for non-eBay sales seems a bit silly.

Am I missing something?