If Apple had explicitly promised Aperture 3 purchasers free updates until Aperture 4 and then they'd put out Aperture 3.5 with new features only on the App Stor

If Apple had explicitly promised Aperture 3 purchasers free updates until Aperture 4 and then they'd put out Aperture 3.5 with new features only on the App Store (and told people to just get over it because it's too hard to maintain two versions), then the situation would be similar. And people would very rightly be pissed.