I think that we must seperate the types of horsepeople we are talking about when we discuss relative levels of dysfunction, and I don’t mean Western vs. Dressage vs. Eventing vs. Jumpers. I mean those who show on the circuit and those who don’t.
I think that those who do not show in any of the big circuits, or perhaps do one or two big A shows a year are perhaps more grounded.
I say this becuase in two seperate periods in my life I have either spent time only on the local circuit or only flitting in and out as a spectator, groom/helper, exhibitor at A shows.
In the local shows you tend to see more parents around, more supervision of juniors, more people who’s entire lives are not the horses, who do not spend every penny they make and moment of free time that they have with the horses. They tend to be slightly more well rounded in their approach to life (ie shows and showing are not their sole existance for a large part of the year).
At the A shows however - the money, the attitude, the sense of entitlement, the lack of junior supervision, the intense level of scrutiny, the need to keep up, the need to win, and the desire to look some ideal (whether weight, fashion, horse, whatever) seems far stronger and more prevalent.
Very few of the professionals I’ve encountered have college level educations, ever read a newspaper, or are ever surrounded by people that are not syncophants. They do work incredibly long hours, have to deal with often extremely needy rich women and children who expect them to be father/mother/therapist/coach all at once.
The competitors are not often enough the tough, tenacious hard working, understanding of the value of a dollar, thoughful, pitch in a pinch type of kids or adults. They are needy, too rich for their own good, expect to buy their way into success, too easily awed and drawn into the rockstar-partying lifestyle that is common, and that only seems to help erode their sense of self and their self esteem.
OK - before you start screaming at me - we all know and love those people that do not fit into the above stereotypes. I’ve found trainers who, although can party like a rockstar, are extremely grounded, keep their juniors in line, and can talk about and focus on a million other things than the horses.
I’ve found dear friends who show in all the big east coast shows all summer long, but we can have serious discussions about investment banking, child rearing (even though none of us have any) and a dozen other things that are in no way related to horses.
It seems to me, at the end of the day, and at the end of this long rambling post - the people who are not dysfunctional maintain a balance in their lives of friends, interests and pursuits off of the show grounds and outside the barn.
That balance is what I aim to keep - and given my extensive opinions spewed out in a wonderfully random fashion just now - when I start to lose this balance, you all are hereby appointed to slap me upside the head! 
Sarah