I think that some people consider domain squatting parasitic because it creates little or no value and takes a corresponding level of effort. The analogy would

I think that some people consider domain squatting parasitic because it creates little or no value and takes a corresponding level of effort. The analogy would be bridge with a toll booth vs a gate in a natural mountain pass with a toll booth. In both cases there is a service (passage from one area to another) for a fee. However the former is providing a service, the later is removing an intentionally created obstruction. The only value I can see it providing is that the system places a valuation on domains based which prevents desirable ones from being bought by people who don't "seriously" want them. However that logic is shaky (transfer domain from non-serious to serious) and the value is questionable.