Staying small has the major disadvantage of having to compete with everyone else who thinks they can run a business without overhead expenses.
Including side-working JW's sitting on wait lists half the year, handypersons, and GC laborers that molest electrical without doing taxes, licenses, workman's comp., or advertising. They have no administrative overhead, take cash on the barrelhead, and the majority of volume for owner-builder permits, which indemnify the AHJ.
AHJ's indemnified by owner builders limit their inspection mandate to code compliance of accessible locations, and can furlough licensed specialty inspectors during funding crisis. The replacement entry-level combo inspectors are jacks of all, masters of none, can lack multiple-language skills, or familiarity with other regulatory / enforcement issues.
These AHJ combo inspectors walk among illegals, passing owner-builder renovations that bury unqualified-construction defects behind walls, with too many appliances tied to one fuse, or energized plumbing. The defects remain undeclared when properties are flipped for re-sale, unless later uncovered by qualified persons capable of code-compliant repairs, or uncovered during insurance claims.
Cancelled insurance policies and non-renewal is standard industry practice that leaves ignorant buyers with no legal standing.
The reality is that you still have marketing, sales, accounting, and administrative expenses even when the owner performs those tasks himself. They just reduce the amount of contracting work the owner can do and charge for, or add to the number of hours the owner works for free.
Qualified persons capable of code-compliant construction or repairs, not afraid to advertise, can avoid the owner-builder business, with commercially-managed property that demands more qualified assurances for investor indemnity, albeit inundated by contractor hacks & illegals who invite liability upon themselves.
The end result is low bidders remain exploitable in every market niche, and everybody can demand indemnity except home owners, who must bear all liability and furnish the orifice for final exploit.