Your effectively killing your market, with the constant bombardment of emails, very few of a helpful nature.
It takes time to go through products and put them to use. Please quit with the distractions, your losing them due to failure to focus on the task they just bought from you.
When they jump from one thing to another the spiral starts and soon they quit, you lose a customer.
I know you all think your just trying to be helpful, but the other side of the coin is your shooting yourself in the foot.