LOL, I went back 10 years when I started out with my first website, a host review site.
I managed to make a few sales over Forum Marketing, Social Marketing and Web 2.0 sites when they where ranking well.
But this is one of the toughest market to be in so ask yourself if you really want to stick to this niche before you continuous to invest your time, even worse your money (I would never pay for PPC in this niche).
It will not be easy to make a living in that niche but if you want to stick to it then I think that the best way is to publish a GREAT Newsletter about Hosting and publish that also as a Free magazine over an App to Android and Apple users.
Focus on user groups which do need hosting like people new to hosting (businesses), people which need to switch hosting etc.
You also could offer a free basic website setup for small business clients for a hosting purchase as an entry offer.
Newbies to Internet Marketing need at some point hosting, what is easier to sell if you run a free IM course for Newbies than over a review site.
The hosting review sites which are making money with free traffic from first page listings are almost all in the hands of a few companies, maybe even proper hosting companies.