Typos are changed free of charge, name changes aren't.
Interestingly Swiss airline Edelweiss charge more for wine than easyJet (their beer is slightly cheaper than U2) despite all of their flights originating in or ending in Switzerland meaning they can technically serve duty free on all flights. U2 are often unable to do so as the aircraft and its bar will operate a non Swiss flight either before or after the Swiss rotation and therefore duty free wouldn't apply anyway. So who's the bigger ripoff artist?
Similarly if crew want to buy duty free in the UK airports when operating a GVA they will be refused if they're going somewhere else beforehand. I've had it happen to me before and had to wait until I was operating just a GVA.
Interestingly I have looked at Ryanair and Wizzair and can find no Swiss only pricing so therefore they're doing the same thing: ie providing a product at a price that people are willing to pay for.