On 3 December 2013 11:03, Peter Todd wrote: > UI once both are implemented is to not show anything in the default > case, and explain to the user why they have to pay extra in the unusual > case where they are spending a whole bunch of dust. Yes, that's the other problem with a merchant setting a fee - they have no idea how large the transaction might be. If you spend a bunch of dust the fee could be 2 or 3x the expected fee. Then you might get merchants including higher fees by default to account for this. That means we end up paying more per kb over time.