From my experience, Amazon's quality of execution and resulting customer experience is just so much better than that of (most of) their competitors. Most people

From my experience, Amazon's quality of execution and resulting customer experience is just so much better than that of (most of) their competitors. Most people therefore tend to gravitate towards them over time as they have negative experiences with other companies. Personally I don't like the fact that Amazon is evading taxes here in Germany so I often try to order things (personally and for my business) on other websites, but honestly there are very few suppliers that can match the price and speed of Amazon. From my personal estimate, about 50 % of the orders I placed with other suppliers didn't arrive on time / as promised due to various reasons: Sometimes people would put the wrong address on the package, sometimes they would just forget to ship the item on time, sometimes their inventory management system would mark an item as available when it was already sold out, sometimes the payment wasn't correctly processed. After wasting several hours of my time dealing with the (often unresponsive) customer support of these suppliers I tend to order most things on Amazon even if the price is slightly higher, as I know that the delivery speed and customer support will be outstanding.