Fortunately for us new(er) search engines (I work at blekko), only a small fraction of websites actively block crawlers from new search engines. It's a chicken and egg problem: we're going to have a big index for a long time before we have big traffic.

I also have a bunch of hobby websites, and I agree that bing crawls a lot more than Google and sends me a lot less traffic. And Yandex and Baidu have very little English-speaking usage, so they aren't sending me much traffic.