CPM cost could be $10 or higher, with RON traffic at around $5 (from my experience).
Say, CPM @ $10, with average banner CTR at 0.5%, it would mean that I will be paying $10 for 5 clicks, which means that the CPC is $2.
Making ROI on $2 CPC is challenging - it would mean a CR of 5% on a $40...