if you have ever payed for video capability in your camera .. you've been ripped off massively!
You're thinking of video ability in stills cameras in the wrong manner. Don't think of it as a feature you paid for and not using .. think of it as a feature that's purely free to 'ya!
The features you do pay for that you may sometimes use, or not, or whatever are: wireless!
Wireless needs more hardware. Hardware that the camera manufacturers need to buy in, spend money on engineers to implement and so on and so forth.
Besides, stuff like wireless is actually best done externally(via an accessory) that is well implemented, and of an inconspicuous design type too.
Something you may have noticed since the introduction of video in DSLRs. There appeared to be a significant jump in high ISO quality, ever since DSLRs began capturing video!
My belief is that(always has been) that as they increase the inherent bandwidth capability of cameras(this is a requirement for better quality video!) .. signal to noise ratios, increase.
Increasing SNRs, generally mean better (higher)ISO quality and or dynamic range.
Either of which I'll gladly take if that means having to put up with a useless and never used feature such as video capture capability
Now! .. GPS and Wifi ... in camera ... errrr. Only if they double battery life to go with that please.
Two of the worst features for battery drain(them and liveview and/or EVFs).