Seeing as how the federal government in the US is in almost complete shutdown (I think it was 800,000 people at last count?) people are focusing on needs vs. wants right now. They don't need stuff on ebay, they need food, electricity, running water, etc. This is creating a ripple affect across the country, both in small companies and big ones. Ones that depend on "frivolous purchases", like Ebay, are going to get hit the worst. I'm really hoping things get back to normal soon, or we're going to be nosediving into another recession.
That said, I'm thinking before and after Christmas will be the best time to sell stuff right now. Unless you have holiday-specific things to sell, like Easter, Halloween, etc.