So, (when considering the automation I speak about) do not think about spreadsheet documents containing one or two click_able buttons that allow a user print a page or copy some cells from one sheet to another. Instead, I want you to picture an application(or Entreprise Information System) that customises the appearance of your spreadsheet workspace(to take advantage of maximum screen capital available on your PC), and offers you custom "floating" data entry forms.
This article is meant for those individuals/businesses who sometimes experience a need to use their spreadsheets in the (somewhat "impersonal"?) manner described above, to get the results they want. That need would often arise out of their lack of requisite skills to get the spreadsheet to behave the way they want _ or limited time to devote towards incorporating necessary automation to make it do so.
This last point in my opinion is ONE major benefit you must seek to extract, if you choose to engage the services of a developer. S/he should be able to help you develop (in_house) expertise needed to maintain the application AFTER s/he is gone. If you fail to ensure this, all your cost_savings from using the application might end up being spent paying the developer to maintain the application over time in the future!
For instance if a company had five drink brands in the market but notices that Brand A, which has a profit margin of at least twice the others is in greatest demand, they could (a) focus production efforts on that brand, so that more bottles go out to trade (b) Apply Best Practice/Continuous Improvement initiatives that would result in lower costs of producing each bottle of Brand A so that even though the market price remains fixed, the company is able to earn increasing profit margins per bottle.