I say 300 to 350$ is the realist price, at this price point (Assuming the PS4 is still 400$) it would make sense for the customers (mostly) given that:
- There should be some sort of corelation between the performance of the gadget you get and the price you pay (I.E. games are compromised on this system, even exclusives don't run so well so far).
- ALL extra features that are worth mentioning are behind a paywall, you don't really have them when you buy the system, anyone who doesn't have gold can't even browse the web or use your existing Skype/netflix/HBO accounts with their xbox one!
- As far as I know most consoles were subsidised at launch (sold at a loss) because console makers expect to recoup that loss with game purchases over the lifetime of the machine (by example the PS4 loses money to Sony until you buy 1 game or get 1 year of PS+).
This is how I rationalize it, then I could see the reason behind all these "but people do not notice x, y or z as a difference, they don't care!" they would really not care about getting the lesser version because it would have saved them money and well, if they really don't care why not save themselves money in the process? (let's say you don't play that much...), but now this is, well if you don't care why would you get the lesser machine anyway?
