Classical philosophers like Hume came up with some great ideas, too, especially considering that they had no access to modern scientific knowledge. But you don't have to spend thousands of hours reading through their bad ideas to find the few good ones, because their best ideas have become modern scientific knowledge.

The reason why people read those works is to figure out how those people arrived at their wrong conclusions, what has changed so that we today know better and what this tells us about possible shortcomings of contemporary ideas. Learning from the failure of history and about our cultural evolution and the associated conceptual revolutions are some of the reasons to read what you might perceive as simply outdated.