I do think that walking trials are of critical importance to the game in general. A guy can get a good first dog and compete if he has a pair of boots and a whistle plus a borrowed blank gun. Little real money until you get hooked worse.
In the simple days, I actually started trialing when in the ownership of a VW beetle pulling a very light sheet metal home made dog trailer. I hunted the same dogs with the same rig and often think about how easy it all was in those days. Just pull on your hunting clothes and grab the dog and some shotgun shells and off you went. Of course, there was more open land and way more birds back then.
A key ingredient for all field trialing is fun. If you enjoy the people at the trials and the fun they are having, you'll perhaps want some of that. And if your dog is competitive, then you're really capable of having fun if you don't take it all too seriously. In any stake, there are only two or three winners and the rest are the unrecognized fourth place thru DNF (did not finish).
My biggest thrill is having my dog do a good job in my eyes and then having others say the same thing. If that happens, you likely will get the nod from the judges as well.
You can linger on the inexpensive side of the sport for a long time or jump in with the dually, aluminum trailer and three colored up horses as your pocket book rebalances away from other priorities. I have always been very aware of the guy who shows up with one dog in a beat up horse trailer with a nag that looks like it's been ridden to death. That guy came to win the field trial!