When opportunity knocks, investors should answer. This luxury stock rarely trades at a discount, and now might be the time to take a ride.Every investor out there loves to claim they've found a hidden gem in the stock market. The automotive sector might be low on the list for most investors searching the market for hidden gems, as it's known for being a capital-intensive, low-margin, and ultra-competitive industry.That rule of thumb doesn't do Ferrari (RACE 0.96%) justice, though, as the ultra-luxury sports ...