They do it all the time.
A possibility may be that they don't know it's the vendor price, the default one, and think it's the advised prices, since that's what other MMOs do.
Another possibility is that they want to just get rid of it no matter (like most people say they do) so they just don't care.
Or they want to keep people from actually making any sort of gil out of it.
Or....they're just completely stupid.