14.29$ transaction fee is absolutely not normal thing.
I have no idea what kind of plan they have about it.
But the possible reason is so many block chain transaction has been stuck for
so many days.
Maybe this is the only reason not to let any small transaction through bitcoin address.
It's not just about coinbase. Even blockchain.info is also asking for similar fees. But we have the options to change it in blockchain. I think it's high time we start using the segwit enabled bitcoin address which starts from "bc1" instead of using third party wallets like coinbase or blockchain. Start using the newest version of Electrum light wallet. While installing, it will prompt you whether you want to use a standard wallet or a segwit enabled one. This segwit enabled wallet will give us a peace of mind and super fast transaction at a very low fee. It's not super cheap but way more cheaper than coinbase.
Also it is very much possible to send transactions from a standard bitcoin wallet to a segwit enabled bitcoin address. So we all need to start using it for the betterment of the bitcoin network.