I agree with you. I have enough trouble trying to get my keywords ranked with Google let alone having to worry about the others. Then again, maybe the smaller search engines would be easier to get your site ranked higher with. 🙂
If you’re ranking well on those sites (they could be blog networks, social marketing sites, and sites) you can get great results on all the search engines because these sites can get Indexed in the bigger search engines and bring you results both through the little sites and the big ones.