A few things of note.
First, steam cleaning isn't really widely used anymore. Hot water extraction is frequently referred to as steam cleaning, but there isn't much steam involved in the process thanks to stain resistance being stripped off by it.
Second, not all dry cleaning methods are created equal. There's a world of difference between rotary bonnet, encapulation, dry extraction, and HOST dry extraction. Cost, training, results, you're comparing apples to oranges to the rest of a produce market by lumping them all together. Do your research.