I think that i'm reaching the number of master now
I've just got this number after lots of trials and testing.
Here's what i did to have this number
I joined into a lot of groups and forums to understand more about
my ideal customers.
I wasn't only offer free stuff, giving away free stuff is not good all the time
But i copy and tweak also. I copy the contents from the sale page that i wanted to promote
then tweak them a bit and see the data.
Check and tweak then repeat all over again
Finally i got into this point.
I hope this help