DoItYourself

Hi guys. Does anyone knows what is average popup/popunder conversion in main niches like gambling/dating/crypto?
I am not asking about profitability of investing in this kind of ads. But rather creating my own popup/under technique on my own websites related mostly to adult.
How much do you think unique views of that exactly ad are needed to generate a single conversion? I know it probably depends on many factors but I am just curious if it's matter of hundreds or thousands of unique views. Thanks.