I support DBT. I'm happy with my rig (look at my sig) and I'm glad that I've washed my hands of caring about equipment before the transducers. It gives me much less to think about.
A warning - the rest of this post is philosophical.
What are some of the other questions associated with this thread? What is happiness? What is perfection? What is the point of music and what does music convey to us?
While these may seem like attributes of the music and equipment, they are really just reflections of one's internal mental/physical state. Music can convey emotion, energy, movement, and all those things. Perfection does not exist in the real world but many human beings have moments where they feel perfectly content and think their world is perfect. Happiness is the same. If we focus on all the defects in something we'll never be happy. If we focus on the all the positives of things we can be happy.
Is the goal of music is to convey emotion, feeling, and energy, you can be really indifferent to the equipment you have and still get everything music conveys.
I've got an expensive rig now. But in the past I've had everything from a mono clock radio to a tape based Walkman with free earbuds. Did any of these systems some how block the transmission of the emotions and energy in the music? Not at all. Did I have a less fulfilling experience when all I had was a $10 clock radio? Of course not. I enjoyed listening to music then as much as I do now. The depth of emotions and experiences I had then and have now are the same.
If the goal is simply to enjoy music any system can do that.
I think there is a far greater difference between having no music and a listening to a crappy clock radio than there is between the clock radio and a $10K headphone rig.
Audio is a hobby. The goal is for hobbies to enrich your life. If this hobby is making you miserable and is spoiling the music you listen to I suggest you step back and try to figure out what is really going on in your mind.
I suppose all this can be summed up by the popular saying "You'll be happy with your rig when you stop listening to your equipment and start listening to your music."
Ahh...I've waited a long time for somebody to start a thread topic where I could throw out this philosophical mumbo jumbo. What does that say about me philosophically?
**edit**
With all my rambling I forgot to tie in what I wrote with this questions posted by the OP.
I don't think believers or non believers are either inherently happier or unhappier, but DBT believers have arguably removed the number of variables they feel are relevant to what they are looking for. One could argue that less complication equals more happiness but it probably makes this hobby more boring.
There are all kinds of people here. Some people buy equipment, play with it, enjoy it thoroughly for a while, then change things around when they want to try something new. Even if you do support DBT, you might want to change your headphones for something new.
Then there are people who seem to be miserable. They are constantly comparing the old and new and things are only good until the newness wears off.
I think there are some major philosophical differences between the two that has nothing to do with equipment/music.