Are post-credit scenes after a movie the new "hidden track" after a music album?

[DetlefK]

Back when music was recorded on vinyl, you knew that the album was over when the music ended. Then some artists coined the trick to add another track after 10 or so minutes of silence. Thus, the "hidden track" was born.

It became something normal to add a hidden track and the tradition stayed alive well into the era of music-CDs. Now the audio-file of the last song contained two songs, with about 5-10 minutes of silence inbetween.

This worked with CD-players, but as we started using PCs for playing music, that surprise got spoiled all the time.
"Oh! The last audiofile is 15 minutes long? That must be the hidden track!"



Now we have something similar with movies. Post-credit-scenes used to be something rare and special. Now every movie has them.

The ultra-super-special mega-secret scenes have become so normal that it's now noteworthy when a movie DOESN'T have a post-credits scene.
http://io9.gizmodo.com/logan-director-explains-lack-of-post-credits-scene-tho-1792989704