More people search for a domestic beam than for anything else here. Somebody opening up a kitchen wants a price and a lead time, and it is a small job that most fabricators never write a page for.
Contractors search in trade language. Structural steelwork, mezzanine floors, portal frames and specific standards come from somebody with drawings already, and those enquiries are worth many domestic jobs.
Building types are separate markets. Agricultural buildings, industrial units and mezzanine floors have different constraints and different buyers, and naming one attracts work that a general page never will.
Quotation speed is a ranking factor in practice. A contractor pricing a job needs a figure within days, and a fabricator known for answering quickly gets asked first the following time.