Litecoin Selling at a Near 20% premium on Coinbase as New Investors get FOMO, potential arbitrage opportunity?

After looking at the Litecoin markets on coinmarketcap I was surprised to see that Litecoin was selling for over $70 more on Coinbase/GDAX than on Bitfinex. The only reason I could think of is that a lot of people who have recently joined Coinbase have been experiencing the fear of missing out after seeing the price pump recently. Could this be a potential arbitrage opportunity for people who have accounts with both Bitfinex and Coinbase? I know we have seen some big differences on exchanges recently with the bitcoin price but to see a 20% difference between two exchanges that are both trading against the USD is rare.