Agreed....it's still a market that needs to mature, and develop a more universal standard, instead of being fragmented by proprietary protocols.
Usefulness so far....agree, not really.
The interest is there for me more out of.....because I'm a tech geek by trade. ~20 years of doing IT consulting for SMBs has me interested in this different angle of techie gadgets. Bored with building and playing with different router distro's at home, just looking for something different to play with.
The "save money" concept is certainly not my driving force. I know spending a grand or more on these gadgets.....I'm certainly not ignorant enough to believe I will recoop that money in lower electric bills. It's things like thermostats that can be controlled remotely...(granted you can do that individually)...as my wife and I travel a lot, it would be nice, while on the plane back home, to remote in and turn up the heat in the winter when we're a few hours away from home, or in the summer turn the AC back on a few hours before we arrive home. Luxury..I know. But I'm not about to plop 250 bucks a pop (I will need 2) for those NESTs. Honeywell has a few I might drop 160 bucks on though.
Those light bulbs that can hop on the program...even change hues and colors....just a neat thing to play with.
Remotely managing the door locks and garage door could be neat. Furnace guy needs to get in the house between 10am-12am...and we're away...no problem!
Needing an internet connection does not bother me....broadband has gotten quite reliable in recent decades. Myself, for our business, I've built many of our MSP/RMM tools up on cloud servers, for universal access from anywhere.
It's a growing market, expanding in uncontrolled different directions. There are not a lot of articles/reviews out there now, save for affiliate driven "blog" reviews....so it could generate a lot of traffic here.