This is so true on so many levels.

Books I've read that ended with cliff hangers (sorta):

Magnus Chase

Kingdom Keepers: Shell Game

The Marked Girl

The Isle of the Lost (except for this one you had to wait for the movie)

Trials of Apollo

Mark of Athena (poor Percabeth!!!!!)

Alice in Zombieland

Maximum Ride: Saving the World and Other Extreme Sports

Michael Vey 5: Storm of Lighting (oh when will you get here Michael Vey 6: Wrath of Hades!!!)

Lost Hero

Son of Neptune

That's all I can think of........... So yeah.