you loose google ranking from people using bots from just a number of VPS IPs emulating web traffic. If google finds out, they will place you in a sandbox and wont show on the search engine. Hitleap traffic is exchange traffic meaning that the IPs which hit your site comes from almost everywhere. I've done with close to 100k of traffic hitting 1 single site and works like a charm . but then again that was 2 years ago.