Not to mention Newegg
Which used to be a very reputable company many people trusted, until they were bought out by a Chinese company and turned into a "marketplace". You don't know what you're getting and customer service took a bit trip downhill as well.
Pretty much any site that operates as a marketplace is a scammers haven. At least with something like eBay you know that going in, and if you buy similar products again and again you can use sellers you've had good experiences with in the past. That's worth a few extra percent in my book for peace of mind.