I received a speeding ticket in NV a few years ago, doesn't show on my CA driving history...
AFAIK they are not reporting to other states unless it is a major violation (criminal). For mine the cost of one of those "Speeding ticket in NV? Call us!" places was going to run the same as the ticket charge ($150ish) so I paid the ticket and went on with life.
Apparently the policy is... NV plates get a "safety violation" while out-of-staters get a speeding ticket. Lovely, isn't it?