Finding good services to outsource your work can take years and is ever changing. You must know the difference between high quality work and pure shit. You also have to try to stay away from services, which might become saturated, outdated, or nixed by Google. Testing is also a big part of this. Way too many SEOs rely on other's data (or none at all) to make decisions for their clients. While, I rely on others data, I also test the shit out of things internally. Knowing what works is hugely important. If you go in all willy nilly, it can cause issue in the future.
Also, and no offense to BHW, but there are a ton of other places to find great services to outsource your work. The services I do outsource have come from years of making connections, not only from BHW, but other boards as well. Don't pigeon hole yourself.