IMO, it's like most industries... if you work hard, you're fairly bright, and you don't fall apart due to women, wine, or just being crazy, you'll advance fast, make a good living and retire comfortably.
Same in just about any industry. I mean, you can be a janitor... and if you're not a stoner, insanely lazy, crazy, etc, in 5 years you can advance and manage a team then start your own thing and make a solid living.
There are surveyors that are millionaires, and some that are living in a trailer late on their rent (I know cause I used to live next door to one).