I've only ever seen top 10%, 20% and 30% as the percentages for the user's "best" tags listed at the top of a Careers profiles.
Are better percentages possible? Is there any interest in adding top 5% or even 1% ranks?
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Are better percentages possible?
Top 10% is the highest it goes. And by highest I of course mean lowest; 10% is the best percentage careers is capable of displaying.
Much has changed since you asked your question. Currently, the top 1% mark would the best achievement one can obtain in a given tag. The top 5% mark has been added as well. Cody Gray's story is a great illustration of both.