We have to come to know our particular value, in our particular market. Each is different. Some markets will not bare a super high end carpet cleaner, others will.
The size of your business will be affected by the direction you push. If your goal is simply to get as many trucks on the road as possible, leave the vacuum, rotary, 175,
CRB, Zipper, etc at home. (Maybe not Zipper as it looks like a high production tool).
I think it's important that the direction you are pushing reflects the type of person the owner is. Either can work (quality or quantity) if you commit to it and work it.
Lots of smaller biz doing well here. Look at Mike, Jim M.,
Saiger, etc...
Bigger doing well too, Hagopian is a great example.
Personally, I'd rather stay small and strong. I'm not sure I'd do so well managing a fleet of 30 trucks. I struggle with anxiety as it is!