yeah I find myself in the same position. I am currently at 25, really don't see any other names dying to be added at the moment. I can be convinced, obviously, but like you said, not just ticking names.

In the beginning I only chose people I had some sort of personal interaction with. I realized fairly quickly that the witnesses were a bit too busy for me to contact each and every one of them, so I had to read up and figure out who I wanted to trust.

While I stated above that using a proxy is a good idea, I don't do it for myself, as I know I am unlikely to agree 100% of the time with anyone I might choose.