Rainier Asphalt & Concrete in Seattle asked this question and found their niche business model made the investment pay off.

Block pavers, paving stones, and concrete pavers are used sometimes in driveways and walkways. Asphalt road construction and paving services include asphalt paving contractors, asphalt maintenance ...

and subcontract the paving to a qualified and well-equipped paving contractor while retaining 10 to 20 percent of the contract value. Door knocking, word-of-mouth, and distributing door-hanger ...