Why do arbiters or chess players put the kings in the center once the game is over?

So I have noticed it a lot of times... Once a professional game ends an arbiter puts the kings in the center or changes the position on the board... Why is this?

To signify the game is over?

The Kings indicate the result.

If kings are on diff colors it means it was a draw.

If both Kings on white, then it means white won.

If both Kings on black, then it means black won.

So at a glance the scorer could get who won on that board or if it was a draw.

I must admit.. it's rather annoying that the arbiter does that.. 

the games are taped.. everyone knows who won and who lost.. let the players  analyze the game without ruining the last position by moving the kings..

It has to do with the DGT boards to finalize the game on the software.

Thanks for the details about this ritual. I had been wondering what would happen if one starts to play chess in these positions! There are some musings here https://chess.stackexchange.com/questions/42761/who-has-the-edge-in-game-over-chess

How effective or qualified the arbiters are in local and college tournaments ?
(1 being the lowest and 10 being the highest)

depends on standard of your college. eg. iitb or cgc landran

but why