Wow! I can't even imagine a track where the good drivers won't help. I've been in the hobby for about 15 years now, and every track I've been at has been full of great drivers who are willing to help. On occassion, there is a racer that won't help, but they are the exception.
I have had the good fortune to race with many great drivers and have learned a bunch from them. Now, I am able to help newer drivers myself. It's great to see a new driver learn something and improve.
As was stated before, become friends with the other drivers, don't just try to use them for their knowledge. Also, don't hound them. Ask a question and listen well. Try what they tell you and let them know how it worked out. Try some things on your own and talk with them about the results. This will help build the relationship with the other drivers and you'll get more help.