Not OP, but I've done some work in the space. The market is just saturated now. It takes such little effort to start a dropshipping "business" that unless you have a really unique angle or spend absurd amounts on marketing, you'll probably make somewhere in the range of peanuts to beer money.

Even if you do find a successful niche market, it won't take long for a low budget clone to jump in, which invalidates a lot of the up front work in marketing and product validation.