I think you're missing out. A different perspective is to just see these devices as temporary and enjoy them for as long as they last. Let's say you can expect 2 years from the device, and it costs $480. That's $20/mo - maybe that's worth it or maybe it's not for any particular device. But at least you can make the choice that way.
I think this way of looking at it is valid, although I don't personally like it very much because it generates a large amount of e-waste.
Regardless, using your model on this device: it costs $725, and if you buy now, won't ship until September. So if you assume 2 years from the device starting today, that's about $35/month.
