Sony have charged someone 61.31 euro for a replacement screw. Presumably, they didn’t ask the price before they ordered and so Sony got away from it. It is also likely that the screw can be returned and a suitable replacement procured for somewhat less.
I guess from Sony’s perspective the issue is this: they could just send out a screw for the cost of postage or they could charge outrageous prices and make a killing on the occasional sap who bought but didn’t return the screw. The latter plan is a good idea if there are no repercussions as the former plan makes no direct profit. I guess the wave of internet posts today tell us otherwise. Oops.