You will NOT make your money back on Virool. Virool is very empty advertising. It's difficult to target an audience with Virool because of where your stuff is displayed. You can affect this to some extent but ads are played in locations where they are unskippable and imo, irritating to the person playing the game they see it in or whatever. I wouldn't want to be associated with that advertising, even though it is legit.
Unless you turn it off, Virool ads are served as mandatory things before weird gambling games and stuff. It's difficult to target those audiences and very rare for them to click out of their games on a mobile device to go check out an advertisement. You need to be a real pro to do any converting on it.
If you set Virool to NOT advertise to those places or countries, and really try to target an audience via demographics and region, you will get WAY less views for your money. This again means, very low conversion rates.[DOUBLEPOST=1368927178,1368927086][/DOUBLEPOST]In my opinion, if you're going to spend money advertising, get some of your own campaigns going in your neck of the woods and/or use google's advertising.
If you're going to be doing any advertising, better to learn how and where and use the tools that let you customize it to the target audience you want, which is on YouTube.