I switched to selling in Australian dollars as soon as I could, ages ago now. Overall, it has made no difference to the percentage of my sales that are local or international. I sell about one third internationally and two-thirds locally.
But it is so much easier for me. I don't have to change my prices when the currency fluctuates, and I don't pay the currency conversion fee when I withdraw money from Paypal. The customer does as it is built into the US$ price that they see. My international customers don't seem to be put off by the price being an irregular amount, or the price changing when the currency does, or even the small increase in the price they pay. Overall, my sales have increased since this time last year, but the ratio of local/international is the same.