Some clients try to cache search results, I don't know if they are picky about how close the files are to their connection, but I think it would be within about TTL 5 most of the time.
When they say Gnet can't scale, I think they forget about this because for every one host that replicates a search result of another, you reduce the "net" load to half. So try to simulate that on some super computer and let me know how your math comes out.