I like to be able to buy all sorts of things on the Internet not only on eBay or Amazon, but also on many other websites that are usually not that popular, but still offer good prices.
One of the reasons I like to buy online is that online stores usually offer better prices. Of course, I want those stores to be legitimate. After all, I want to give them my credit details and I do not want to be scammed while doing so.
I discovered already some time ago that legitimate online stores have good customer services. If I want to know if a website is legitimate, I can call their customer service and ask them anything.