Even lots of power users just use laptops (and AWS) and don't buy components. And sales of consumer electronics like point and shoot cameras, DVD and CD players, GPSes, etc. have fallen off a cliff.
Anecdotally, my local Best Buy is always packed. I do a good amount of shopping online, but I also like to get certain things in person when possible. To me, it's much more satisfying to buy something and be able to use it on the same day.
Sounds like you could make a good business out of being an "online shopping guide", to help people pick the right [whatever] out of an endless array of [whatever]s. Do credit cards offer this as a concierge service at some level?