I don't know too many audio players that get free updates that allow apps to be installed. There is nothing wrong with charging for your work.
huh? You're paying for a software update (notice the difference between update and upgrade) that allows you to BUY programs. It's like charging you to enter the Apple store simply because they built a new one. Does no one else see the humor in this? I might actually try this with my friends: "sure you can buy a soda from me, but first you have to buy the rights to buy that soda from me". Good stuff.