All of the lists you stated have a set number of winners, which remains the same year by year. You either make the top ten or you don't. If you make the top ten, you are rank ordered according to established criteria. There aren't ten movies winning the best picture Oscar.
There might be 10 or more amps rated class A by Stereophile, then, when another amp appears that outclasses all the current class A amps, rather than bumping all the former class A amps to class B, and class B amps to class C (and pissing off a whole lot of manufacturers and subscribers), the outclassed class A amps hold their A rating and a new, A+ class is created.