Personally, I think that when people set money goals on ebay, before they set work goals, they're doomed. Everyone I've ever spoken with who scoffed at me for listing things I may make only a few dollars off of, because their time is so precious etc. Is off of ebay.
Ebay these days is a List it and forget it place. It'll sell, maybe this week, maybe in 3 years. Most people can't focus on work, they can only focus on the reward, and on ebay, that wont work unless you are selling only new stuff, or have awesome sources. And both of those are EXTREMELY rare.
Set goals for work, try to get 500 things in the store, try to list 20 things a day, then you'll see how difficult both of those are.
Remember, you'll sell, but you need to have a good mix of new listings (some percentage of which will sell in a week, some in a month and the rest will become long tail) and old listings to get an average amount of sales that can sustain you.
Be VERY careful, and put a lot of time into how you store things. Those people who remove things after a month of it not selling or so, are just not gonna get very far, nor last very long IMO.
