Is a unique IP address required?

Now that most registrars allow nameserver records to be created that have the same IP address as a previously registered nameserver (this was not allowed before as far as I know).

Is there any reason to pay extra to get a unique IP address from my host to point my nameserver entrys at or should I just do the dual mapping of them onto the hosts existing dns servers. Does this breach any RFC or have any technical drawbacks?

 

 

 

 

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