Question [Q] Developer Edition vs Unlocked

This is going to be a fairly stupid question, and it seems that similar questions have been asked but never really fully answered.

I will be purchasing the new HTC One M8 and I cant understand the difference between the unlocked and developer edition. I am aware that the developer edition has an unlocked bootloader, but couldn't I just get the unlocked variant bootloader unlocked from HTCDev.com?

If that is the only difference, it seems they wouldn't make two different variants and just direct developers and those who wish to modify their phones software to HTCdev.com. I feel like there has to be some other difference.

Any info would be great.

Thanks