Off-page seo is also a really good idea if you want to rank for anything with traffic. True white hat (per google's definition) is a myth.I am sure, this traffic comes from some illegal ways. Try to do some proper on-page SEO instead to these fiverr gigs... Getting traffic from Google with proper keyword research and on-page SEO is enough.
And I really do not get why 15 people has the need to say the exact same thing. I think the OP got it the first time.