What about people who want performance somewhere in the middle? There is clearly value in knowing the performance difference.

I'm not saying that there would be no value in having benchmarks which compare the JITless, easily embeddable JS interpreters against JITed, hard-to-embed browser-quality JS engines like V8 and SpiderMonkey. I'm just saying that those engines aren't really Boa's competitors, certainly not its "main competitors"; it's a different kind of thing that serves a different need.