Yes I agree with that, happens all the time. Its also a fact that the domestic or residential client is much more interested in what you are doing and how you are going to go about it (and in particular the likely result), than the majority if not all commercial clients. Reason being, the residential client is the person that actually owns the said item, and its in their home. Commercial clients are looking for a good improvement on how it looks at the time.
It is reasonably easy to make a grotty pub or restaurant carpet, look outstandingly clean, because by the time they call you in to clean them, they are usually really manky. The RX20 saves a lot of sweat in easilly dealing with this scenario, and although you could do it just as well (imo) with a good wand, an RX20 makes life easier. With a very large area, this where the RX20 comes into its own, and (imo) is essential.
Dave.