At http://bitmit.net/en/trade/i/2019-16gb-extra-dropbox-space/description price is set to 0.99 BTC (= 5.10 $). Can this be changed later on ordering as you are saying to offer "pay what you want"? Too lazy to register yet to bitmit to check it out by myself
Yes, it's not really advertised well, on bitmit, but once you have the order page, with an escrow address, it says in the notes that you can use an "individually agreed upon prize" or something like that. The order page will reflect if you sent more or less than the list price - but it doesn't have any effect on the usual escow dance (you send them, they get confirmed, I send the product, marking it as sent, you confirm delivery and the money are released - however much there is in the escrow address).
Cheers!