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I was watching The Avengers last night (26th April 2015) on 7Mate on Australian Television. When I first saw the film in the theater I didn't know who Thanos was or the meaning behind the post-credits scene, but now knowing I was expecting to see it in a new light.

After the credits however there was a different scene. The Avengers (including Thor) were in a restaurant, possibly in New York given its state, eating burgers... that's it. No Thanos, no dialogue, no nothing.

Then I remembered Iron Man 3; post-credits I was expecting maybe a hint of Ultron, however it was just Tony lounging back as if he was having a therapy session (he interrupts the guy who tried to explain he wasn't a therapist).

This got me wondering, do all the Marvel Films have a second post-credit scene which doesn't have any hints to future films? If so, why even have it in there?

There's a pretty solid list here that you can refer to. In short, the latest films in the MCU series seem to have a secondary post-credit-scene whereas the earlier films had only one scene after the credits.

Based on current trends, I look forward to future films containing less than a minute of actual film and no less than 90 post-credit scenes by the year 2040.

As to why they have a stinger at all, the best answer is that it's a nifty way to get you to sit through the credits instead of simply leaving the cinema and ignoring all the people who worked hard to make the film you just enjoyed.

In detail:

• 
  The Incredible Hulk, and both Guardians of the Galaxy movies, each have a pre-credits scene


• Every MCU film from The Avengers onwards, except for Iron Man 3, Guardians of the Galaxy, and Avengers: Infinity War, has a mid-credits scene (i.e. a scene between the fancy animated credits and the regular white-text-on-black credits)...


• ...while Guardians of the Galaxy Vol. 2 makes up for its predecessor with three scenes sprinkled throughout its animated credits


• Every MCU film has a post-credits scene, except for The Incredible Hulk and Avengers: Age of Ultron
  

Most of these 37 scenes — whether pre-, mid-, or post-credits — do foreshadow future movies. (The notable non-foreshadowing, non-comedy exception is Black Panther’s mid-credits scene, which plays more like a heartfelt statement in favour of co-operation between nations.)

The scenes that are purely comedy, however, are all post-credits* — with the exception of the Groot pre- and mid-credit scenes in Guardians 1 and 2 respectively, and the Guardians 2 pre-credit scene with Kraglin and Drax.

_{* I'm counting Avengers, Iron Man 3, Thor 2 & 3, Guardians 1 and 2, Spider-Man, and Ant-Man 2.}