The fees for converting to USD can be very high for some credit/debit cards. As the fee is done per transaction it can get very expensive if you doing multiple transactions. Sometimes the charge at the bank is more than what the acutal value of the product is.

Some people may not be aware of this as the charge is generaly done at the bank and not shown in the total on the site.

For example one bank in the UK is charging 2% with a minimum of 1.75 GBP to maximum 5.00 GBP per transaction.

If you buy 100 Bits at 1.68 USD it gets converted to 1.34 GBP and then a 1.75 GBP charge is added on top at the bank making it a total of 3.09 GBP.

Having local currency would avoid a extra cost we have on our end at the bank to convert to USD.