If you sell stuff on Bandcamp, and most of that stuff sells for $12 USD or less, then please do yourself and Lady Justice a favor by signing up for PayPal micropayments. Instead of their standard transaction fees, which work out to about 33 cents for a $1 payment and 45 cents for a $5 payment, you’ll part with only 10 cents on a $1 payment and 30 cents on a $5 payment.
After switching to micropayments, all items sold via that PayPal account (through Bandcamp or elsewhere) will use the new rate. That means that if, on some other site, you sell a lot of items priced higher than $12, a micropayments account may actually end up costing you more in transaction fees than a standard one. If that’s your situation, you might consider using two PayPal accounts, one with micropayments for Bandcamp sales and another with the standard rate for your non-Bandcamp, higher-priced transactions.
Switching to micropayments isn’t irreversible. You can pop back to the standard rate any time by contacting PayPal.
Update: PayPal’s micropayments page doesn’t work properly in Safari. You’ll need to use either Firefox or IE to sign up.