Posted in here a while back and good to see this thread is still alive. Figured I'd drop by with my overall results from trying this method. I put together a simple review site with 4 Clickbank products.
The site to date has earned me $642. This wasn't with much work at all. I only was able to promote the site for the first month, then some stuff with school and moving got me sidetracked before I came back to IM. About half the sales came in the first month I was promoting it, the other half has just been from residual visitors and rebills.
I've been looking a lot into getting into site flipping as a more long term thing, so haven't been working on this method in particular since. All this was from posting on about 8-10 forums or so. Some links stuck, some got deleted. I picked a rather narrow niche within online gaming, so my options were limited.
The site wasn't SEO optimized or anything that I was new, but has ranked for some long tail keywords just from the reviews. Also the domain is now a PR1, which isn't that big of a deal, but I didn't do any other backlinks besides the forum ones.
Although my results don't reflect the title, I don't see it being a stretch at all to do $50-100 a day after a while. You'll need to find a good niche that'll work with this and work for you, and keep expanding on your work. Or you can take the semi-lazy route, and still make enough to fund hosting and other things.
Congrats on your success! Mind sharing with us what kind of niche you used?