Hi Munish and welcome to the forum,
Dropshipping has it's advantages over other supply models, but competitive pricing usually isn't one of them. You have to bare in mind that when dealing on eBay, you're also competing against other dropshippers, as well as large wholesale buyers selling on tight margins, not to mention wholesalers themselves selling direct.
So you have to keep your expectations of what is a good margin when dropshipping, realistic. Of course some do better than others, but it comes down to a lot and lot of research to dig out those little gems where competition is low, but margin is high and sales are solid. It's a very difficult formula to find, but that in essence is what you are looking for with your research.