Eaglerico,
1) How do you find all these guys? Pipe shows and the internet
2) How do you decide to actually go with a carver? In almost every case, I've first met the carver, talked about pipes, seen and handled some of their work before I've bought their pipes. In a few cases I've been so impressed with pipes I've seen on a carver's web site that I'll send them an email, chat pipes and then eventually place an order.
3) The big brands have the reputation and history, have you ever decided not to get a pipe from a carver you found and that you did like their work? Oh sure. Unfortunately some guys just aren't ready for the big time. But about 5 years ago, I met Joe Nelson (Old Nellie Pipes) at the Chicago show. It was his first show and I could tell his engineering was GREAT, even though some of his pipes didn't look that great. I did buy one of the less horrible looking ones because I had a feeling this guy was going to be HUGE. To this day, he practically BEGS me to give him that pipe back because he's so embarrassed of it. But it's like owning an early Clapton recording. It's kinda raw and sloppy, but what collector wouldn't want it?