Mostly because SUPERAntiSpyware isn't the same as it was years ago. You could say that it's "glory age" is over. There are better Antimalware out there now like Malwarebytes Anti-Malware, Hitman.Pro, Zemana Anti-Malware, etc. Plus, SUPERAntiSpyware is almost guaranteed to always return something during its scans, because it also flags cookies (which aren't malicious) and it makes users believe that they are infected because they flaged them as (Adware.TrackingCookies) even though they aren't adware. That's how I see it.
Sorry, but among these, what you suggest, is the only usable MBAM, if it is regitered unrestricted version.
And now, do not start to criticize, I have they all, so I know exactly, what each of them is capable or not. SUPERAntiSpyware have also, but not the free version, but professional. And it is much better then several others, what You named.