HI,   Sorry lane-ends I don't know what you mean, how do you offer free postage?

Simple take an example Dresses, I list them all at same BIN regardless of brand, style or what it will cost to post. Dont even research value or postage cost per each item. Each relist cycle i drop the price, sooner or later someone decides say I will pay $25 to get that item. That is what they pay, they chose that sell price, I did not set it. I did not say I want $x for the item, postage is $y hence "free post" price is $z. I did not build it in, 

At no stage do I add in or separate out item and postage price. Buyer selected how much to pay, and I sent them the item for that price. Whether it goes letter rate, 500gm satchel 3KG satchel, sale "postage free" price will still be same. True I dont like the term free post and would prefer "delivery included' term. That terminology is Ebays choice not sellers.Regardless of what AP charges me to send to buyer, that is irrelevent to buyer. 

Of course buyer may be willing to pay more because they are not being hit with a delivery surcharge.

To take it to extremes you could say that quoting postage separately is a marketing perception to make it sound like buyer is paying less than they are. There are two sides to every approach

If I dont offer pick up listing an item for say $30 is pointless if buyer cant receive it for that price. I use best offer so if combining can make a worthwhile saving I take into account. Most of the time it doesn't as it pushes most things into bigger satchel; plus insurance.

If item goes to INR dispute it means buyer gets total price paid back not postage exclusive price. Buyer is better protected.

Postage cost is my overhead, not buyers, just like any other business cost

Different methods work differently for different products, but this common belief that somehow providing a total price only method is somehow a scam, and offering items at a price that cant be provided is more honest, alludes me.