Originally Kali employed a pricing model based on sales volume, this was considered too much of a hassle by many developers.
Now you can enjoy the industry standard protection (none of the products protected with Kali Anti-Piracy have been cracked yet!) at the affordable $100* activation fee with the successive flat royalty payments of $50 per quarter -- no more sales-based fees!
Think on how much you lose on the piracy -- and the price of the Kali Anti-Piracy license is exactly 101 stolen copies of your $0.99 product. Do a simple math and take the right decision.