Hey guys, I own a NSFW tumblr with 57k followers. Thanks to BHW I had my first client ever and I charged him only $5 to be promoted on my tumblr. He has a very different niche than mine, but I was still able to drive over 100 people to his website. The promotion is still going on so in the end it will be around 150-200 clicks. Most of the traffic comes from US, Canada, U.K. How much should I charge for PPC?