If going to college was truly not worth it, then you'd see a lot more people not doing it. The fact that going to college is a such a common course of action says that people actually find value in it (or there's a giant inefficiency in the market -- which is the argument of this article, but I think it's worth considering the alternative as well).
And I don't think the lottery analogy works. Regardless of what you (legally) do, you can't influence the chance that a single lottery ticket of yours wins. But you can improve the chance that certain low-probability events happen to you (like founding a successful startup) by your actions. And I think going to a good college can be one of those actions for many people.