The iPad Magazine – what’s going on?

iPad owners are spending an average of an hour on their iPad app versions of popular magazines. That’s not quite the 70 minutes spent on print versions but it’s in the ballpark. Meanwhile, the Wired version for iPad is a huge crazy success and the GQ version is a total bomb. Is this because the Wired one was better or because people who read Wired are more likely to embrace something like this? And if the latter is the case, how long will that model hold?