Really, if you don't like the prices, don't buy off of Ebay. I find the whole Ebay situation to be a bit too annoying for me, personally. I have yet to use the site, and I doubt I'll be in any mood to do so in the future.
In my opinion, Ebay provides a service that is easily replaced by simply networking with other gamers. Networking works, just ask Djinn and me. I asked, he spoke up (as did a few others on other sites) and I got just what I was looking for and Djinn is very happy with his end as well. Other than shipping costs and the models themselves, it costs neither of us a penny more.
I guess I've been boycotting Ebay since the beginning...
Still, I don't think a 'negative action day' is really needed or worth advertising. Just don't use the service.