Setting up an on-demand web services business and quotes very expensive to build the platform from scratch. There should be templates for sale by now?

With so many people creating and developing these complex on-demand websites, we should not be reinventing the wheel anymore. Ive seen the Spotfinder template on wordpress but its more of a catalogue or database, rather than on-demand. Im not a developer and feel that learning code wont help as it would be too complex a job to do properly