yeah, I don't think it matters if they read this, scams existed before the internet and ski areas knew about them then too...
Most ski areas do spot ticket checking at higher lifts. It's not common, but they do. And when they catch you, who knows? It is a crime (theft of services), but whether they call the cops, I dunno.
As for the skinning, the real question is what they would do if they saw you skinning up. Would they nab you then? Some resorts, Highlands I believe is an example, allow you to skin if you are above a certain point by a certain time.