People who play 5 or 10 minute chess,
are people who have played for ten years,
and like playing it, because of the unexpected,
and 'exciting' thrill the game provides...
It is a relaxation from tournament chess,
typically after a post game analysis.
Of course the real chess is the games that go for 4 hours plus.
Where deeply thought out plans can be made manifest.
Some GM made the comment that Blitz / lightening chess
was bad for tournament chess.
But I prefer it in a social 'fun' setting.