Master Rug Cleaner is the name of the school. Personally, I think the name is a bit of a dig at easy to get masters designations from other providers.
You can argue if the price is worth it, but it doesn't take too many rug cleanings to pay for, or too many mistakes to equal the cost. The idea is to short-cut the time it would take to become somewhat accomplished at rug cleaning by hanging around rug plants, asking questions or doing web research as problems come up, or learning by ruining. (Think of how many cleaners think oxidizers are OK for everything, just because they're not observant enough or experienced enough to notice what they've done.)
Aaron and Ellen teach the best in biz RIA course, so I'd have to think this course won't give you any questionable tricks to try, and it is one of the few bold enough to teach dye removal.
Mike, Since you're committed to doing things well, and I expect you to be successful cleaning rugs for a long time, I would recommend you take the course.