Ebay Partner Network, is not that easy to get into anymore. A few years ago they were accepting almost everyone.
I guess it's a little matter of research. It's been known that it does take awhile to get approved, if even at all. What was your back up plan if you didn't get approve from EPN? It's just part of doing business. You may have to look at Amazon, CJ, Google Affiliate Network, Etc.
So far I have applied two times and got rejected by ebay. I have applied with my site which has amazon products using WPRobot. Could you guys advice me what could be the best way to get approved by ebay?.