Well all of the above sites you mentioned are developed sites. If you develop Funkin.in, its most obviously going to have some value. But right now as i said before its not worth much. A piece of advice; go though the "Domain Appraisals" section right from the last page and read every thread. It will give you a more clear idea on buying domain names.
Cheers
I'm not sure that means much in this case - there is a big difference between choosing a domain name to use because it is available, and deciding to pay a premium in the aftermarket for a domain that is already registered.