Numismatic Advisory Newsletters

From time-to-time advertisements for so-called Advisory Letters appear in numismatic publications. Has anyone ever subscribed to one of these newsletters? Are they of any value? Are they all geared to investment advice only? Thanks.
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It is published approximately 6-8 times per year and the cost is $48. You can call Mr. Rosen at (516) 433-5800 or write to him at :
Maurice Rosen
P.O. Box 38
Plainview, NY 11803
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