It's not a good question at all and I will tell you why....
First of all, it depends on what you are advertising and Secondly who would be interested and Third how you are advertising it and Fourth how old or new it is and .....so on and so on.
One person can advertise something to a group of people and get no takers.
Another person can advertise the exact same thing to the exact same group of people and get lots of takers.
Just as importantly is your end result.
Anyone can get a thousand referrals.
Not everyone can get an active thousand referrals.
Sooo bottomline, no matter what anyone tells you here, won't do you any good in regards to your question.