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I like being that irresponsible one. Though it is impressive that Amazon has turned a delivery fee - that most people don't like paying - into an exclusive subscription service. A service that customers fall over themselves to sign up for when it's offered at a discount.
I cancelled it because Amazon's abusing their position. Refusing to sell Chromecast and Apple TV, then lying, repeatedly, about the reason when asked? I've been an Amazon customer for 13 years. I was rather annoyed to see them go with the anti-Wikileaks and try to be "sensitive" by banning certain cultural items. But this shows they've zero commitment to selling products customers want. Edit: And it really hurts. Som…
So far, I've found eBay to be in many ways better than Amazon was. Amazon has gotten to the point where you're often buying from some unknown vendor anyways, so in many ways it's already similar to eBay. However, eBay was built from the start to be a simple middleman, so I find its reputation system and expectations for sellers and buyers to be superior in many ways. Of course, I still have to be careful when evaluating sellers, but if I stick to the high-volume 99.5%+-positive sellers, there's rarely an issue.
I mainly only do this for small purchases—rechargeable batteries, game system controllers, cables, etc. For larger items, I try to find a niche vendor that offers more specialized customer service—ideally a local brick-and-mortar, but often an online seller.