As far as I understand authors get payment rate based on sales volume. Why do not customers get discount based on purchase volume?
Prices are set by the author, you can discuss with the author individually and make a proposal for him to discount if your purchase XY or XYZ files, but by default, Envato doesn’t have a bulk discount.
Cheers! 
Hi there, just have another question out of curiosity. How do I get Envato licence if I agreed discount with exclusive author? I am returning buyer and wish to get 5 licences of the same item now. Is it even possible to get such through Envato? Do not get me wrong, it is just a question.
You’ll have to ask the author. They can give discounts if they wish! 