Jiu jitsu can easily become an addiction. There are dozens, perhaps hundreds of submissions, each with dozens of set ups. There are counters to techniques, and counters to the counters. Every single position has innumerous variations and subtleties, all of which take practice to master. Different opponents will challenge you with a myriad of styles, each of which you must be accustomed to. Every day new techniques are being created, popularized, and perfected. Jiu Jitsu is both exhilarating and frustrating – exhilarating in its intricacy and diversity, and frustrating in its complexity.
With so much to learn, it is easy to fully immerse yourself (even become lost) in the art. There are countless stories of people spending thousands upon thousands of dollars on instructional dvds, top-of-the-line equipment, seminars, private lessons, and tournaments. For those who aren’t competing, there are always high-level tournaments available to watch, either in person or on pay-per-view. Podcasts, blogs, and magazine subscriptions all offer tips and tricks, keeping practitioners up-to-date on the latest and greatest competitors and techniques. Some people quit their jobs, pack up their belongings, and travel across countries and continents to train at famous academies with famous instructors. Some people end up living in an academy, mopping the mats and sleeping on the floor as payment for instruction.
I suppose there are worse addictions.
At the very least, jiu jitsu keeps your body in shape and your mind sharp. Physically, the worst you can expect is cauliflower ear, an occasional injury, and perhaps a case or two of ringworm. To show for your addiction, you will have a sharpened skill set, and an accompanying confidence in your abilities.