We cancelled Amazon Prime, and besides the annual fee, we noticed that our household retail spending went down significantly. It turns out that when it takes more than 1-click to buy stuff… we buy less stuff.
As far as convenience, one of the reasons we felt it was time to cancel is that we can just as easily get almost anything we wanted from Amazon direct from the seller or via Target/Best Buy/B&N/B&H. Surprisingly, this is often cheaper than Amazon (and almost never more expensive). While there’s a bit of added friction to think for two seconds which store to check, the benefit of fewer impulse buys seems worth it. Plus, we haven’t ended up with any crappy knockoffs since we bailed on Amazon.