The answer is simply to bring back negative feedback for buyers. Negative feedback hurts more than a $2 fine and easy to implement (re-implement)   What does the forum think about this? How can we make ebay hear us?

Negative feedback rarely hurts buyers. If you bothered to read the numerous posts in various threads about this matter, you would know why eBay got rid of it and why there is a snowball's chance of them reintroducing it.

Negative feedback doesn't help a seller using BIN or against buyers who snipe. That pretty much covers the bulk of transactions on eBay, so even if it were possible, it would be of no benefit.