It's not blockchain.info's fault.
The low fee is entirely blockchain.info's fault. They have something in their software which limits the maximum fee to be 65 satoshis/byte, thus making any transactions made with their wallet have a low transaction fee.
OP, You have a few options here. You can wait and hope it confirms, wait for the transaction to be "forgotten" by the network, or ask a miner to confirm it for you.
For the third option, you can contact the users
Quickseller and
macbook-air.Unfortunately you will not be able to attempt a double spend with a transaction that pays a higher tx fee. Blockchain.info does not provide the advanced functionality necessary to do that.
Nothing AFAIK, it's even costing the money, because they won't earn as much on TX fees. So I guess they're doing it just out of niceness to the Bitcoin community. And maybe to promote their pool and BU a little
I think they are trying doing this as a PR thing to promote their pool and BU.