It's an interesting and inevitably divisive point. I think we have all felt the pain of missing out, so don't feel alone in that! It's a Retrobike 'if only' thing...
One thought occurs to me, which is, if sellers see 'needy' wanters, then it's hard to imagine the price is going to be tempered by 'market forces'.
On another related topic, being able to sell on here for similar technical reasons (traffic/searching) is forcing my current shed sale onto the dreaded FB. I'm wracked with guilt about this in many ways, believing as the OP does, that we're part of a community and that our sales are part of it - in terms of content and keeping it amongst ourselves. Guilt was tempered somewhat when most of my buyers are RBers hiding in the undergrowth! I still have items for sale here that have been on 5 years + - yet the same items crop up on Ebay and are brought to our attention here as though they have just arrived from Mars!