I have had similar experiences, but even if the traffic is 90℅ useless, that means 10℅ isn't. It's an auction, so bid an amount where clicks from each particul

I have had similar experiences, but even if the traffic is 90℅ useless, that means 10℅ isn't. It's an auction, so bid an amount where clicks from each particular network are profitable to you. There are some niches where brand advertisers and well-funded startups willing to lose money will suck up all the inventory unprofitably. You simply won't be able to compete with that type of activity unless you also have money that you are willing to light on fire. However, there are pockets of profitability within the PPC arena. They shift quite a bit at various times based on the competitive landscape...an unprofitable niche today may be a profitable one two months from now after someone that was driving up bids burns through all their cash. You just have to monitor and deploy when the CPC is low enough for you in your niche.