2019 MARKET UPDATE: FANGS FOR THE INCREASE
Maybe it's as simple as ASM #101 was seen as an under-valued key issue sandwiched between ASM #50 (1st Kingpin) and #121 (death of Gwen Stacy).
There is still no concrete evidence of a movie for this character. That hasn't stopped solid gains in the past 12 months.
It's hard to go wrong with most Spidey keys, honestly, though others did much better for you this year than #101.
2018 MARKET UPDATE: WHERE IS THE MORBIUS MOVIE?
The excitement about this book won't go away. It seems genuinely scarce in CGC 9.8, and the highest grade seldom comes to market.
Still, it is setting records, and brisk turnover ensures its spot on the 100 Hot Comics list. Spidey fans are never going to tire of first appearance issues.
Prices of CGC 9.6, 9.4, 9.2 and 9.0 have appreciated rapidly since this time last year. You did well if you bought a year ago.
2017 MARKET UPDATE:
There is no confirmed sighting of the Living Vampire in the Marvel Cinematic Universe, but he just isn't going away. No smoke without fire?
This book NEVER comes into the office in nice shape. It's always between VG and FN. When they do show up, there is excitement in the market. Note that no copies of CGC 9.8 have sold since 2014.
Vampires are hot in general. In fact, zombies, vampires, all things undead. Couple that with the usual rumors about Marvel's deal to bring Amazing Spider-Man back into its Cinematic Universe, and the probably new reboot, and the possibilities are endless.
Speculation about Morbius is rife. He's a pretty cool character, and unlike most of the other super-villains in the Spider-Man comic books.
This book is quite tough to find in really high grade. Most of the copies we're offered in collections have been well read. The dark cover doesn't take kindly to handling.
Definitely worth a gamble, especially as Amazing Spider-Man is the world's most collected comic book.
Other issues on the Hot 100 include: Amazing Spider-Man #14, ASM #50 and ASM #129.