I think i understand your point of view and i agree with your sentiments, but do you honestly believe that Eliezer does this all for the money? I think that he likes being able to spend all his time working on this and the singularity institute definitely treats him well but the majority of people on less wrong including him really do want to save the world from what I've seen. As for his statement about cryonics, if hes passive about i don't think many of the lurkers would consider signing up. Cryonics seems like a long shot to me but i think its reasonable to assume that he writes so emotionally about it because he honestly just wants more people to be vitrified in case we do manage to create an FAI. I would love to hear more about your reasons for skepticism because i share many of the same concerns, but so far Ive hear lo to the contrary wisdom on LW/OB.
It's an interesting question that I'm pondering.
Now, while I do question the intellectual honesty of this blog, I'll link to it anyways, since the evidence does seem interesting, at the very least: http://wattsupwiththat.com/2010/01/04/where-are-the-corpses/
http://wattsupwiththat.com/2011/05/19/species-extinction-hype-fundamentally-flawed/
It does seem that environmentalism can mimic some qualities of religion (I know, since I used to be an environmentalist myself). As such, it can cause many extremely intelligent people to reject evidence that goes against their worldview.
Furthermore, it's also possible that computational chemistry may soon be our primary agent for drug discovery, rather than discovering more biological compounds in certain ecosystems (that being said, drug discovery is entirely different from drug synthesis, and discovering a gene that codes for a particular protein and splicing it into an E Coli bacterium is going to be far easier than anything computational chemistry can do in the near future).
With that all being said, what now? I do believe that there is something of value that does get lost as habitat gets destroyed. But it's hard to quantify value in these cases. Certain animals, like crows, chimpanzees, orcas, and elephants, are cognitively advanced enough to have their own cultures. If one of their subcultures get destroyed (which can be done without a fullscale extinction), then is anything valuable that gets lost? (besides value for scientific research that has potential to be applicable elsewhere?) And is it more important to worry about these separate cultures, as compared to worrying about different subspecies of the same animal? Certainly, we're now beginning to discover novel social networks in dolphins and crows. But most of these animals are not at risk of extinction, and even the chimpanzees and bonobos will only get extinct in the wild (at the very worst). There are other less advanced animals that have a higher risk of permanent extinction.
What we're prone to systematically underestimating, of course, is the possible permanent loss of micro-organisms. And of novel biological structures (and networks) that may be contained within them.