The other issue is a lot of people offering accounts are straight up scammers. They'll sell you the same account to five different buyers, or it's already flagged and just hasn't been suspended yet. You pay, log in, list your products, and three days later everything's gone. You can read about how and where you can safely buy eBay seller accounts here:
https://gologin.com/blog/buy-ebay-seller-accounts/ . The article covers the whole process and what to watch out for. Main thing is gradual transition so the system doesn't pick up on sudden changes.