No. It is very likely that the sellers in both cases did not close their own accounts but were closed down as crooks by eBay.
Go to the Resolution Centre and start an Item Not Recieved Dispute and mention that the seller is Not A Registered User. You will get a refund in short order.
Paypal also Holds your payment for up to 21 days if the seller is new, in a high value or high fraud category or has a poor selling record. It is very likely he will never see your money.
But you will .