Why to use the command 'keep' (item)

You drop a stretched-flesh bag.
Thanks for recycling.
You have 63599 gold.
(171 H 28 M 354498X):
### Sadly, Rollo the Fencer was killed by Cujo and his followers.
(171 H 28 M 354498X):
say FUCK
You say, "FUCK".
(171 H 28 M 354498X):
Huklebuc says, "DOH!"
faint
(171 H 28 M 354498X):
faint
You faint.
(171 H 28 M 354498X):
faint
You faint.
(171 H 28 M 354498X):
faint
You faint.
(171 H 28 M 354498X):
faint
You faint.
(171 H 28 M 354498X):