John,
Understood and agreed. (There is one way to feel better about this, become an
ebay shareholder. That way, when they make decisions which favor profitability, you can feel a bit better about it.

The unfortunate truth here is that as stamp collectors we are riding the shirt tails of this business model. (Not unlike the way we are riding the shirttails of the coin forum.) It is not simply a coincidence that other attempts at building a stamp-centric auction sites have run into difficulties. Two compelling operational costs in any online auction site are 'cost per transaction' and 'support'. I have seen multiple posts on this very forum where folks have opened cases for stamps for less than a few dollars.
For an auction site the cost per transaction is the same for a 50 cent sale as it is for a $500 dollar sale. But you also have to support handling any transaction problems, including returns and dispute resolutions. (You can push some cost back to sellers/buyers but you still have to build and maintain the infrastructure and personal that supports this overhead.)
I am afraid that we are stuck with being low on the totem pole. We can switch out
ebay with some other online venue but the issues would still be the same. No one is going to want to develop, implement and support a significant site which encourages the buying/selling of low value items.
Don