Service charge flat rate fee 0.0002 BTC for each sale.
I like a lot of things about your paywall but not a fan of having fixed fees and your current minimum of 0.0005
BTC [I know it's not much but it limits smaller sales].
Files and media data under 200MB hosted for free within 1 year. Files greater than 200MB hosted for free for 72 hours.
How much you're going to charge for hosting files beyond those periods?