I was going to say "nihilist egoists", but that works too.
I think advantage play needs a bit of a more stringent usage when talking about "professionals". For instance, I just took some glass bottles to recycling and got a couple bucks, does that mean I'm a professional recycler? If you asked the homeless guys in line, the answer is "no". Colloquially, I'd say that advantage play needs to be a primary source of income for you to count as a pro.
And yes, pros do have more information. Especially something like holecarding, where it seems the bulk of the work goes into finding and tracking flashing dealers. Once you finally get to the right table at the right time, it seems that any trained chimp could handle playing it.
There are other examples from the past of information that started out "secret" among the pros that developed it and only gradually became common knowledge. Ranging from card-counting itself (prior to 1961), to shuffle-tracking, ace-sequencing, depth-charging... and then there's the talk of countermeasuring Mindplay and CSMs, which I've only heard talk about, and know little of the details.