When doing blackhat SEO, the whole method is different. Whitehat is about establishing yourself in a niche and dominating it over time. Blackhat is about burning up a domain after the ranks start to fall, then either redirecting or moving the content over to another domain (there are more options than these two).
Essentially, you can have it as a common business practice to just rank domains fast and just make more to replace the deindexed ones. It is a method, and it works.
However, what you are looking for is longterm, so whitehat is the way to get there.