It would be worthwhile to drill down to the details page for some of those rogues and focus on (1) what rule classified them as Suspected Neighbor and (2) what devices were they discovered by.
If they've been discovered both wirelessly and wiredly and they're not being managed by AirWave, then Suspect Rogue might be a more accurate classification. If they're only seen wirelessly, then Suspected Neighbor could definitely make sense.