Whether the wage premium is a signalling issue or a skill issue, it's still a fact.

Yes but correlation isn't causation.

(EDIT: I want to point out that the statement "going to college gets you good wages" is just as magical thinking, when expressed solely in that manner, as "It rains sometimes when I dance." Demonstrate a causal link between the two if you want the fact of their being correlated to be treated as meaningful.)

And while I congratulate you on your own good fortune, you are generalizing from one example.

I am expressing a general principle through a single example, yes.