As a show and internet dealer you should know that happens with every single book now. Not "hyped" independent titles. The Big 2 movie books are the most over-hyped books out there.
Marvel Preview #4 sold for a high of $3,900 in 2014. The year of the fist GOTG film. The high so far this year is $2,300. Still a popular movie character and actor in general. The market has changed a lot in the past 5 years. Internet hype is a subset of that, but not the only reason.
Also, Todd is no longer a current title. As I stated. If the writer would have kept it going we do not know where the value would be. Again, as I stated, look at Saga.