A person who wants to make BJJ into a career needs to look for more than just good trainnig partners and excellent instruction (although those things are a must). He has to look for opportunities to learn the business.
Most of the professional BJJ competitors I know personally have some means of paying their expenses during their losing streaks or when they are injured. Owning and running a successful school, and putting on successful seminars, appear to be the most popular choices.
There's a massive difference, financially, between owning a successful school and working or teaching for somebody else who does.
To own a successful school (as opposed to a failing one), you need a good location, great teachers, and a business system of some kind. If you plug into a franchice such as a Nova Uniao or Gracie Barra affiliation, you get the business system as part of the deal. However, you need to know how to run every aspect of the business, from the front desk to the teaching to the bookkeeping. Generally, the pro competitor will team up with a financial backer (frequently one of his students or friends he's trained with and knows extremely well), and do the lion's share of the teaching while the other guy manages the books, keeps the lights on, and updates the Web site. That leaves the pro competitor free to travel and compete as needed, or to book seminars.
These last few years, our academy has spun off three healthy affiliates in other cities, each of which has a home-grown black belt as a chief instructor. At present we've got three career brown belts at our academy: guys who plan to make their living in BJJ. They're all teaching classes, or working the front desk, or taking accounting or other courses on the side. Eventually, we expect someone to snap them up as chief instructors for their own school, and when that happens they'll be fully qualified. Meanwhile the money most likely isn't fantastic, but the immersion in the industry is vital. One guy used scholarships to put himself through college while he trained. At this stage of their career, being in a school that allows them to have a taste of the business management experience is just as important as a school that provides good quality instruction.
Other people have proposed Alliance HQ, AoJJ, Atos, and various other schools, where the quality of instruction is clearly world class. It may be worthwhile to find out whether any of those schools have opportunities to teach, work the front desk, and learn the business.