There should be little reason why sellers should charge more on here. Granted there are some big sellers who get discounts that we could only dream of, but for the average seller items should be at least 5% cheaper on eBid. If everybody did that then we would attract more repeat buyers. And you are right in that we need more sellers, but I think they would be more likely to come over if there were more buyers. Plenty of disgruntled eBayers, but they will not make the change until they know there is another platform that they can sell on.
On pricing I have just listed some boardshorts and swimwear. I always check eBay to make sure that I at least match their best, and on most I am 20-30% cheaper, but they are selling more on there. The word needs to get out to buyers somehow, we will all benefit.
On the window sticker front, I am still willing to go forward with this. It looks like cost is not a major hurdle, if people have ideas, taglines or suggestions I will be glad to hear from you. Anybody who is more artistic and would like to create something would be even better. Would just need the OK from the boys to use any logos and I could make a start.