When users who accept multiple currencies and have an exchange rate processor enabled go to edit TLD pricing under Packages > Domain Options: Edit for the TLD, they see tabs for each currency, with the first being the default currency.
Some are alarmed that they see no pricing set in other currencies. But if they have an exchange rate set, then these are being converted on the fly and the only reason to set a price is to fix it and bypass currency exchange.
So, I think adding a blue info box in the modal, directly above the pricing table ONLY for all the non-default currencies should help to explain this. It can say:
You have an exchange rate set for this currency, so it's not necessary to define prices here. If no prices are defined for this currency, the currency will be converted automatically from your default currency. If you define a price here, it will be used instead.
NOTE! ONLY show this box if an exchange rate is set (other than 0.0000) for this currency.