Same Account Buy & Selling Any Problem?
No problem. You can do it.
Yes! You can also use your Fiverr account balance to make orders as a buyer. It’s pretty handy because that way you don’t have to pull out your credit card or PayPal details. I’ve done it several times myself and it was sooo worth it.
“Only registered users may buy and sell on Fiverr.”
The above is from the Terms of Service at the bottom of the Fiverr main page where all the rules as to how Fiverr works are explained in detail.