Pay what you want
It would be great to offer a pay-what-you-want feature specifically for the pricing of the download.
This should also include an option for minimum pricing.
This concept has shown to be efficient especially with very diverse customers, such as schoolkids, students, workers and academics.
Mostly it leads to follow the inner need for fair pricing.
It is also be great in combination with charity promotions campaigns.
Anton Cherednichenko commented
That is a great idea!