I try to when I can, but I tend to have major difficulties doing so.

I tried Ebay, they restricted my account and said the only way for me to get it un-restricted was to buy a product from a limited set of brand-new partner suppliers (e.g. Logitech, HP, etc) that were all over $100, and nothing I actually needed.

I tried buying some chargers from Anker and they also restricted me and said they wouldn't let me make a purchase because my email seemed suspicious (I don't use Gmail), so I had to go back to Amazon and buy it there instead for practically the same price, even though it would have actually been cheaper on Anker's own website since they had a discount code that would have worked for my order.

I bought something on Target because I'd been given a Target gift card, Target cancelled my order 3 times and made me contact customer service to remove an invisible hold on my account.

I frequently try checking third-party sites for the same products, and the prices are way higher (e.g. A product I plan on purchasing is $80 on the manufacturer's site, and $58 on Amazon, with the price frequently dropping to $38) because Amazon literally mandates that the cheapest price must be on Amazon. Often times, these price differences are so drastic that I could end up paying double for the same product.

I also tend to get Amazon gift cards from relatives even though they already know I dislike using Amazon when I don't have to, so it's often somewhat unavoidable.

Don't get me wrong, those are just the worst instances so far. I've bought quite a few items from elsewhere before without issues, it's just that I tend to have the occasional issue that makes it practically impossible to buy elsewhere.

Believe me, I do my best to not have to spend money on Amazon, but it's either so drastically more expensive that it's simply not reasonable to buy elsewhere, or for various reasons I mentioned before, I'm not even capable of placing an order in the first place.