PLR helps bring good traffic?

A few months ago, I have purchased a PLR (Private Label Rights) package of health and fitness contents and articles for my health and fitness blogs. I am updating it everyday, at least one article per day posted on my blog. But the question is, does it really affect my earnings on Google Adsense due to its PLR content? But what about the original content? If I can create my own original content with keyword density, does it make my traffic improve due to its content, or I would stick to PLR?

Original contents are useful but expensive, but PLR's are less useful but cheap as well. We'll for me, at least I know how PLR's affect the traffic and revenue on my blog. I can still do SEO on my blog, but there's still a big difference between a PLR and an original content.