There are lots of Gurus pontificating about how easy it is to build an ecommerce website. It’s not true.
Building a user-friendly site that functions as it should is hard. There are lots of moving pieces and errors cost you money and annoy the customers. Even if you use a service like Shopify, Etsy, or eBay it isn’t simple.
Good domains are hard to find!
If you want a dot com domain, everything short and good has been registered. They are being held by speculators in hopes of a big profit. All my domains were registered because I thought they had potential to generate AdSense income.