I really do love classics. Some of my favorites are Robinson Crusoe, The Scarlet Pimpernell, Around the World in Eighty Days, and of course P&P and Jane Eyre.
Maybe I'm drawn to the history--being able to step into the author's world and live and observe characters from the point of view of someone who lived during or near that time.
I think that another reason that compels me to pick up a classic is that I enjoy the code of conduct that people generally lived by until the 1800's. To be called a gentleman or a lady meant something. Even during the late 1700's there was a distinction strongly preserved, not by rank alone, but by conduct, that distinguished a gentleman from the common man.
George Washington was known for his ability to overlook an insult or at least answer it in a calm and rational way. This was considered a mark of "good breeding". To treat an undeserving person with respect that was not due them was expected.
The basic principal was that in difficult situations, a gentleman or lady was expected to rise to the occasion. The bar was set high. I've hear it said that people are like teabags: you don't know what is really in them until they get in hot water.
I'm not so romantic or naive to think that this code didn't have its drawbacks. I can see how people must have stuffed down their real emotions to a fault. I also see how pride in position or self-importance would get in the way. I like Rhett Butler's assessment of Scarlet: she's no lady.
I also see that a more relaxed setting might be able to kick back and enjoy life more, though Elizabeth Bennet does give me reason to believe that laughter often emerged in refined settings too.
Maybe I just like the good stories that I find in old books. Whatever the reason, they hold a charm for me that I don't find as often in modern books.