KyroMaster, when you're low-id, the server will only hand you out as a source to other people connected to that same server. Similarly, clients won't forward you through source exchange.
So, it is much more important to be on a popular server (Razorback, Donkey Server No1 and No2). Also, to a signficant extent, it doesn't matter how popular the files you are sharing are, it matters more which files you are trying to download. If you are downloading files with many sources, you will connect to those many sources, and they will be able to see and queue up for any files you are sharing which interest them.