I sometimes measure the success of a new Hot Wheels series by how fast it sells out. If I never see one in a store near me or for sale from a local colle.
Collecting Hot Wheels cars is more than just having a display of miniature vehicles you like. Hunting for your favorite models is a big part of the game! I know people that constantly browse through all the existing Hot Wheels stores in their cities in hopes of finding those rare Super Treasure Hunt casts.