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Marketing companies have done studies regarding the saturation level of ads. If I show the same person the same video ad over and over, it gets to the point where it has the opposite effect of that which is desired. This is something that Zynga needs to learn. I've had mane times where I've seen the same ad 30 to 40 times in a row. After about 7 or 8 times, I am sick of that ad. After 15 times, I vow to never buy that product, no matter how enticing it is.
I understand the need to run ads. But be responsible about it. You're doing your advertisers a huge disservice by repeating the same ads over and over again, ad nauseum.