you can hide certain levels, from showing in people, by making it invisible to them, sure.
if you hide certain page blocks from "standard" then premium can see him, but standard cannot.
so in the people page, if you dont want standard to have access to see who is premium, you can hide ...hmmm, warum .. warum... warum...
i see what you're asking, i am uncertain right now.
are you wanting to hide say, "account" or "premium" from standard?
or say hide "account" from "premium" ? or vis a vis?
this is an interesting question..