We have been buying traffic in large volumes for 2 years. There were questions, but they were always resolved in a positive way.
There were issues with the approve (in terms of time), but they've solved this issue as well. At the moment, support works fast enough.
Support helps with black and white lists. Just regularly asked if everything is clear and how the traffic comes in. It asks for suggestions to improve the work of the site.
There is an opportunity for taking a credit.
In the screenshot you can see the amount of purchased traffic.
Good profit to everyone!