Sky bitch about global mode but they only have to look at their own products quality to see the cause.
This. At least in the article in the Herald where Sky, TVNZ and Mediaworks all dropped the global mode ads (Streisand Effect, anyone?) TVNZ and Mediaworks were honest enough to admit it was because they didn't want to advertise a competitor (although strangely they're OK with advertising Sky).
Since ditching Sky, I don't even have free-to-air NZ TV any more - I don't even have an antenna on my house for it. And I don't miss it.