I think one-day ‘bargains’ switch on
some people’s ‘seeking’, competitive drive.
The feeling of achievement comes from beating other people at the race.
There’s also the ‘joining in’ aspect that’s so powerful
in those who need other’s approval-
society praises you for following the crowd,
for doing the herd thing in spite of the foolishness of it
(when you’re buying something you don’t need
or which isn’t even a bargain).
This behaviour is further reinforced
when they post their haul on social media.