They are not your problem. You paid $10k for 47 sales (that is the original example numbers) - is this a good value is the question you need to ask. If this is not good value then you don't advertise there at all, if it is you pay the price.
It is the ad network's problem because they are showing ads to all those bots which costs them. It is also the ad networks problem in that they are not effective - maybe for your $10k for 47 sales is good enough, but for most it isn't and so they lose customers who pay attention to value. It is also their problem in that by giving a false number of views they lose some face, but this is always a proxy that isn't of much value to anyone.
The more important thing that is your problem is verifying the ads are worth it. How do you know the ad resulted in 47 sales. A large number of adds should be buy this in the future not today, and thus clicks are the wrong measure.
It is the ad network's problem because they are showing ads to all those bots which costs them. It is also the ad networks problem in that they are not effective - maybe for your $10k for 47 sales is good enough, but for most it isn't and so they lose customers who pay attention to value. It is also their problem in that by giving a false number of views they lose some face, but this is always a proxy that isn't of much value to anyone.
The more important thing that is your problem is verifying the ads are worth it. How do you know the ad resulted in 47 sales. A large number of adds should be buy this in the future not today, and thus clicks are the wrong measure.