Actually it just symbolizes the different marketing strategies different shops have.
And that we have a choice on where we wanna shop.
The angry grumpy old uncle that scolds everyone may not be my favourite person, but man he sells great chicken rice for cheap.
You may not like it though, and might want to buy from the store opposite.
I guess what I'm trying to say is that there isn't a "right" or "wrong" way to do things, it's just a matter of choice.
Davis chooses to frustrate the "trying" crowd, and looses their potential deals, in an attempt to make more deals with, and keep the "i want pristine, no scratch equipment, no need to try" customers happy.
This is their marketing strategy, and maybe if they tweak it a little, they'll make more deals, but suffer from high blood pressure and facial cramps from smiling too much. Who knows.
And as customers even more so we have a choice. The shops have to sit there and wait for us to come in, whereas we have to power to browse.