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.
The network is somewhat less congested now even the mycelium fees have gone down a lot but coinbase is an exchange which largely determines its fees using its own will. I think its high time they should now switch to batch processing transactions they are lot cheaper and profitable.