Thanks for that.

I am aware that a small number of my listings do/did have a small additional fee for multiples. The new Australia Post charges prompted a bulk edit of postage policies  but some items may not have changed.. It is a constant cycle of checking and changing listings.

Upon revisiting my items today, my main category (posters and prints) now has all new items as ebay plus. 

This isn't  the case for my other categories, so far. 

The Express Post option has been just added, due to customer demand, as standard post times seem to be getting longer. If I recall correctly, the free postage for plus subscribers only applies to the standard delivery option. 

But really, this post was just to raise the issue of plus customers being charged postage on eligible items. The first customer kept 'buying' until the free postage happened, cancelling the previous attempts. The second customer paid the postage and was given a voucher by ebay.

I personally care little about the plus program, as a seller. Less than 3% of my sales have been to plus customers over the past three months, although that is probably an increase over previous periods.