My opinion on private DNS registrations is that if you are going to use it, it shows that you have something to hide. If you have something to hide, then you aren't trustworthy or trusting enough for my business. Of course, the only DNS info that I've ever looked up was from spammers anyways, and I always don't trust them... so realistically, someone making their registration info private wouldn't affect their customers (if I'm at all like a typical customer).
The people who sell the private DNS registrations tell you that it is to keep spam down to a minimum. Honestly, it doesn't affect spam one iota, since there are far, far more sources of email addresses than people's DNS information... and what is the most common contact address on a DNS entry? "webmaster @ example.com"... so spammers don't bother to look at the DNS for fresh supplies of emails.
If you want to spend the extra money to stop a couple of hypothetical spam attempts, then go ahead. Honestly, I don't see the point.
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