whats a is the best range of CTR ? under what percentage it is too high? under what percentage it is too low?
up to 15 % i think is ok , i never had it ... too low ? 0.20 % is low but not a tragedy because the eCpM makes the first rules
i'm around 5%-7%. it is depend on market segmant. i have one site related to health over age 50 people. i'm getting very high CTR. same as music site very low around 1% .
2% is Ok. I would think even at 5% or 6% on a consistent basis, Google would take a deeper look at your optimization practices.
i dont think there is a max CTR. of course the higher it is, the higher chance of raising suspicion on your account the minimum is 0