Considering that Super Bowl ads cost millions of dollars to air, and usually have to be unusual or high quality, why aren’t they run repeatedly still after the Super Bowl is over (in the months that follow?) It would get maximum value for the sunk cost of creating it, and advertisers already have no qualms about running non-Super Bowl ads over and over again.
Many are.
But the high costs of the Super bowl ads isn’t the production costs. It’s the costs of airing during the Super bowl.
They’d have to rename them…
Could you give an example of an ad that was only run for the Superbowl, and not afterwards? All of the ones I can think of were re-used ad nauseum.
I’m sure I’ve seen big boobed Hardy’s girl commercial quite a few times since the Superbowl. The burgers are dripping and the costume is skimpy. 
I saw the Kim Kard commercial (a shame to waste your data) just a few days ago.
Those are the two I know I’ve seen recently.
I don’t watch the Super Bowl, and generally only hear a bunch of secondhand references to the ads that were shown. But I always end up seeing the ads eventually. Recently I’ve seen a number of ads that I could tell had been Super Bowl ads even though I’d never heard anything about them. They always seem to have higher production values and some special concept or twist. I’m not sure why you think they aren’t shown after the game.
I see what you did there.
Apple’s 1984 ad was run only twice as an ad, once before the Superbowl in obscure slots for award qualification, then during the Superbowl.
It became so famous, however, that it’s been played a zillion times on the web, and in 2004 it was digitally altered so that the woman wielding the sledge hammer wears an iPod.
This version on YouTube has the woman wearing the iPod.
Most Super Bowl commercials are the basis for long-running ad campaigns. The only real change is that commercials might run for a full minute during the game but are cut and edited for the more standard, 30, 20, or 15 second spots in ordinary programming. The full versions can always be found online these days.
The Super Bowl has unusual demographics is that it is seen by every group in society in large numbers. Most commercials are targeted to certain types of audiences - male, female, older, younger, etc. etc. - so they won’t all be seen together at any later time. Some will only run during sports events, others on regular programming, and so be scattered among the hundreds of channels and 168 hours of airtime a week.
Still, the OP must be very lucking in viewing habits not to keep seeing these commercials.
And on re-reading it, I see what I did there, too. Pun retroactively intended.