Adxpansion, plugrush and juicyads
 

They both have very different pricing.

Why?

Which traffic is of high quality?

With Juicy Ads you can buy blind traffic or more targeted traffic. Plugrush is blind traffic, and I never used Adxpansion. What will be "High Quality" for one site will be poor for another.

Plugrush "plug traffic" is the complete opposite of blind traffic, yes we do offer and have "blind" traffic, but our plug traffic is not even close to blind.

I do not think juicy ads sell blind traffic.

I think that http://ero-advertising.com is the best xxx ad company in terms of pricing (both buying and selling traffic). I recommend checking them out first.