My belief is they are done so plan and practical for resale value/ adaptability.
The typical KH wouldnt need much imagination adapt and to be bought by a call center/office space/vets/doctors surgery/outlet store etc etc etc.
Where as an ornate church... dosnt really have alot of scope and puts the property in a niche market.
A shop or company name above the door wouldnt look out of place. Would you agree?