For stealth accts, I wouldn't use IF. If the image paths include your IF username, you are eventually going to get linked. Auctiva has changed their pricing back to a reasonable amount, so you should check them out (if you haven't). Auctiva only manages one acct at a time, but the image paths are more cryptic for stealth purposes.
Research the many IF & Auctiva threads here for more info.
There isn't any benefit to managing all eBay accts with one IF acct, if your spending a lot of time changing image links. Also, I'm sure eBay has historical records of the original image links, even after you change them. It would take some serious digging, but they can get the info if their really gunning for you.  | 
