What exactly do you want to "get out of it?" Do you want to become a trainer? A barn manager? A riding instructor? Do you have a specific riding discipline or breed to focus on?
Keep in mind that you'd really be limiting yourself if your only documented horse-related "credentials" were graduating from one particular BNT's so-called university. Realistically, the only thing it means is that you've shelled out a LOT of money to learn a very, very narrow scope of horsemanship.
The only people who would likely be impressed by that and willing to pay for your expertise would be people who are also Parelli followers. . .and in the grand scheme of the horse industry, that's not
many people. As "big" as they present themselves, the Parelli's are not nearly as influential or important as they think they are.
Word-of-mouth matters in the horse world. It's not enough to just take a couple of classes and have a couple of certificates showing that you passed a course. I knew a farrier whose whole education in his trade was through a correspondence school. . .he barely had any horse experience, and it really showed. And not in a good way.
Potential clients/customers will want to know what you've done, if you've had any success in competition, any other trainers or barns you have worked for, etc. They will want to know that their horse is in good hands, they will want results.
If you want to learn, look into a working student position with a trainer. The pay is not great. You may not get paid at all - you may just "work off" board for yourself or a horse, and training time with the trainer. The hours are long and the work is hard. But good references from the trainer and clients you interact with will do more for your reputation in the long run.