Well, glad to hear you are just curious. People who use the crochet method usually have continual maintenance done on them. The maintenance tucks all the looping back inside, they get rid of what is suppose to happen. All this pulling back in with the hook breaks hundreds of hairs, maybe thousands, each time. For anyone wanting dreads instantly and only for a year or so, then hey, what the heck. If they are aware that the manufactured dreads will not last and they will eventually break off and ruin their hair, it is their hair to do with what they want. As long as they are maintained with a hook, they will NEVER mature.
For people who want dreads for years or for life, waiting two years for neat, tidy, beautiful and healthy locks is worth it.