An eBook is a great idea. I just worry that the information is slightly out of date for people to actually pay for it. I know virtually nothing about ebook formats so this would be quite a learning curve for me. I'll bear it in mind though. I could realistically see 200 x $5 sales per year, which isn't to be sneezed at.
Pandoc can convert markdown into epub. Put it on Amazon's KDP, Barnes and Noble's PubIt, and then use Smashwords to target the other markets.
Plus I don't think it's such a bad idea from a reader's perspective. Seems like the worse case scenario is that no one uses it, and the best case scenario people are able to contribute to improvements.
Worst case is off-topic comments that take time to remove, significantly worse than nobody using it.
It used to be a problem a couple years ago, and sites would then use the API to load in comments and include them server-side. Obviously this wasn't ideal, but it's a solved problem now.
Why are there comments on the page?
How difficult would it be to compile it into an ebook and make it available on kindle/itunes/wherever else? Seems like you'd only need to make a couple of sales for it to compete with the adsense income. Maybe have it so if the visitor has read 3 or more consecutive pages it shows up with an ebook splash page, "advert free and easy to read blah blah blah"