It is because you happen to be spending another person to develop backlinks for yourself rather then purchasing the backlinks by themselves. A guest submit on a huge web-site in the niche can ship you LOTS of referral targeted traffic. One example is, take a look at this spike https://seo-services02356.blogdun.com/30771431/the-smart-trick-of-buy-seo-backlinks-cheap-that-nobody-is-discussing