Does it make sense to do some domain parking?

I have some good domain names that are available and I am not planning to use them for anything (for the most part, maybe 1 out of 6). I was reading that it is not a very good idea, but other people say they made some substantial amounts of money.
I am not talking about some random names, but names that look like that should have been taken and worth quite a lot. Would you just register and go to sedo.com (or maybe somewhere else, where?)

Thank you.