Of course not. I think it goes without saying that within any technical domain is the capacity for a top ~5% performer, who understand such a depth of that domain that it becomes a specialization in itself.

I'm merely stating that the domain itself, is not by default, a high enough barrier to entry to merit any kind of above average salary. Of course if you're a much higher performer, with a much deeper knowledge base within that domain, then your pay will likely reflect that.