If you check my first post in this thread, I weighed in as an opponent to this union idea. My primary objection was because the proposal called for sending huge amounts of money to some unknown person at the head of this "union" who would then spend this money on buying influence with politicians who would, presumably, push legislation to force eBay to change their policies to be more favorable to sellers. That concept, in my opinion, is deeply flawed as it provides multiple opportunities for fraud and is unlikely to produce much of value to the people (namely, eBay sellers) funding the effort.
That being said, the notion of a large number of small sellers banding together (without paying dues to a union) makes a lot more sense. It seems to me the only way this idea has any chance of success is if this includes two elements:
1. A list of very specific complaints; and
2. A list of a VERY large number of eBay members who support the idea
Item #1 would be relatively easy to accomplish. Item #2 is more problematic. To be effective, there would need to be enough eBay members supporting this idea to seriously affect eBay's bottom line. What dollar amount of lost sales would it take to accomplish that? I have no idea and any suggestions as to what that number might be would be speculative at best as a long list of variables come into play. The other potential problem is that, by joining such a movement (whether this takes the form of a simple petition drive and/or an actual "work" stoppage), individual eBay members are painting a target on their back. If, as many here believe, eBay is actively moving to drive out small sellers, identifying oneself as being part of this movement increases the chances of more maltreatment from eBay.
Just some food for thought.