So do you post useful information on Thorntree, or merely go there to mine information, then complain when you don't find what you're looking for? That's a loaded question, but it seems to me a fair one. The best way to have a forum which meets your needs is to set a good example for others to follow.
I post on various Thorntree forums. I also use information I find there. But FWIW you're unlikely to find anything on routings from Sudan to Chad there. It's not really that sort of place. In fact, you might not find anything of that sort here, either.
Good luck with your search. I'll look forward to reading here about what you come up with.