Doesn't that mean they'll actually make a significant loss due to Paypal fees?
PayPal refunds fees when you issue a refund, so you lose nothing.
They refund fees to the client, not to the vendor iirc.
This could cost indiegogo a lot.
"What if you fail to reach the funding target?
We appreciate every bit of support we receive during the 30 days, and every backer will be welcomed into the Ubuntu community. If we don’t reach our target then we will focus only on commercially available handsets and there will not be an Ubuntu Edge. All contributions will be fully refunded."