I used to buy upvotes from minnowbooster and it really did boost my SP quite a bit, But realizing that this brakes the price of steem and sbd I stopped. Now using the internal market to make some small trades which yield kinda the same payback and I'm focusing on finding genuine supporters rather than paying for upvotes. It is extremely hard because almost nobody can notice you from the great post bleed and little people would actually support you with their upvote, but its better this way. 

Thanks for sharing the article, pleople really need to realize that the more they buy upvotes the less value the money received will have in the future ! 

All the best !