eBay combined shipping issues
In a recent transaction of 6 cards, 2 were OBO, 4 were BINs. So, the seller and I agreed on the OBO, no problem. The 4 BINs were reasonable enough, but try as I might to request a total from the seller, it was no go. I clicked the 4 BINs, which, to me was a commitment to buy the cards...I go to my cart, all 6 cards are there, the 2 OBOs indicate I committed to buy them, no problem...the other 4 BINs said I had not yet committed...so, I click the "commit to buy and request total". Up comes a message in red no less, that the "seller is not offering combined discounts".
How can this be? I've already been back and forth with the seller, who, on his listings says "contact me for shipping discounts", which I did. He tell me that eBay won't allow shipping discounts on BINs.
NO way am I gonna pay $4++ per card on the 6 card total, when it should be maybe $6-$7 total. I've had many, many dealings with multiple sellers over a long period of time, and no problem getting shipping discounts for multiple purchases. I ended up paying for the 2 OBOs, and yes he reduced the shipping from $4.99 each to just $4.99 for the 2. I gave up on the other 4.
What am I missing???