Not quite a blackhat but still... I once wrote a program in liberty basic to create 1000s of keywords-rich pages - with content and keywords and shit - within seconds. Each would redirect to an URL of choice through different js file
Then I put up online 10 sites x 1000 pages to see what happens
To my big surprise Google ate it up and after a few weeks I was getting something like 5000 uniques/day from all sites in total which converted at 1:2000 when sent directly to sponsors but 1:750 when sent to nice landing page. Took some adjusting to get to 1:750 though
After 3-4 weeks I put up new 20 sites of same kind and crosslinked everything. At that time though Google got smarter and traffic dropped 50%+ but sites still weren't blacklisted. Anyway I stopped putting new ones as the hits were going down gradually. I wonder if this still would work nowadays, probably not
Anyway I made something like $10k with this and - here's the crazy part - I said easy come easy go, I'll put everything on first football match with my bookie that has fix 1 with odds in between 1.3 and 1.7. I always wanted to do something like this.
I also said if I win I'll never ever bet for more than 100e/month
The first match between 1.3 and 1.7 was Hamburg:Nuremberg I remember that well
Hamburg at em up, 3:0 :D