Sorry that took a little while (had to run up to the shops) - I added two of that item to my cart and postage was calculating at $2.95 (two different colours, so the discount was working across variations).

I had a look at some other listings and in the P&P tab it had a different postage rule in place (free postage on additional items), so the discount for the foils won't apply to the other items, and vice versa.

Basically, when it says [postage discount rule] for each additional eligible item in the payment tab, eligible means only other items that have the same discount rule in place. So if I added a few items to my cart, the postage would calculate like this:

1st foil - $1.95

2nd foil + $1.00

3rd completely different item (with free post rule on additional items) + $1.95

4th completely different item (with free post rule in place) + $0.00

Total postage calculated in cart = $4.90

Hope that makes sense. o_o