Simple friendly pricing
Pricing on basis of revenue share - that's the most popular win-win solution. This default option is based on trust in GameArter and its skill and experience to deliver the best performing ads, optimized IAP design, used promotion way and quality of its other services as a whole. Rev share is here the motivator for never-ending improvements of GameArter services.
Next advantage of rev-share model is fair price for everyone. Everyone pays for the service the same relative price in a form of low percentages from revenue. Shortly, developers of popular games do not pay "tax for their success" in a form of higher pricing to subsidize less successful games which would use the service for free like it is usually in a case of other companies.