Speaking from my own experience as a consumer who has made purchases from Amazon for over 5 years, I have purchased more electronics than anything else. Once a registered customer, I have received e-mails advertising the top ten deals in electronics for the week. My uncertainty is the chicken/egg dilemma - which came first: was I purchasing electronics so I was targeted as an electronics consumer or do they automatically send those out to all registered purchasers.
I have also found myself seeking out difficult to find items and invariably, Amazon has had what I have been searching for more times than not. Its ability to provide the hard to find item and ship it overnight has made it a most attractive vendor.
Their pricing is very competitive; their service is excellent and the ease of their website is very attractive. I will continue to use them....frequently.