I run 7 accounts.
3 are connected, 4 are not. The three that are connected are connected by PayPal only. If one were suspended, there is a high chance that all of them will. The remaining 4 run all of their own information, own IP, own name, own bank accounts, different geo locations, etc. Not traceable by eBay/PayPal. All are legal and legit.
I can easily switch any of them into my main. All have feedback of over 400, and each one sells at least 20 items a week in different categories.