Actually, if you go to SpywareWarrior.com you'll find that Spyware-Nuker has been de-listed as a rogue. See http://www.spywarewarrior.com/rogue_....htm#de-listed
Furthermore, it is a common tactic by "registry cleaner" applications to find errors, but not fix them until you pay. Registry Mechanic by PC Tools (a reputable company) uses the same tactic.
And don't get me started on the advertising networks, they're so screwed up that even reputable companies like McAfee and their Anti-Spyware product show up as an advertiser in Adware apps.
But the real problem here is objectivity. It seems pretty clear to me (IMHO) that Spybot is harbouring a grudge against this company (despite it having made significant changes) and as a result is handing users biased and misleading information. So what you say? Users can make their own choices? Wrong. Users rely on Spybot to make those kind of choices for them trusting Spybot to give the the correct information. And it just doesn't appear to be happening (in this case).
Note: This is in now way an endorsement in favor of Regsitry Nuker or Spyware Nuker - I have no idea whether they are good or bad apps. My point here is that the industry needs and requires unbiased and accurate information.