Hey so I'm sure a lot of people doing tiered link building are standing on blogger and tumblr as their main platforms for web 2.0s. While those, combined with some tiered guest posts, are pretty good for ranking keywords, there is a super simple type of tier 1 still largely undisclosed in many blackhat communities and that is .edu blogging platforms. If you are in college or know someone who is, check the school's website for blogging resources and 99% of U.S. schools will have free blogs. They likely keep these blogs forever, never deleting them. So go ahead and create one, get some articles spun, post em up with contextual links to your money site. These are going to be highly trusted authority domains which pass along more TF then other 2.0 platforms. Then just do typical tiered link building after that. I mean, it's a .edu domain, why wouldn't you want some links from there?