They don't care about fixing it because people still flock to them.
And who can blame us? Other sites still suck worse. I can't believe how bad walmart.com still is - the user experience is night and day. Walmart - the retailer embracing computerized tracking of spending by credit card number and other advanced data analytics a full decade before Amazon was even a glimmer in Bezo's eye took forever to realize the power of using their stores as local fulfillment centers? Provides a 3rd party marketplace that's less reliable than craigslist? Who the hell is in charge of online operations at these big companies and how do they still have jobs?
Then again just look at Sears - the company that literally invented mail order *in the 1800's* and how they completely missed the Internet - the ultimate mail order environment.
Ugh.