Productized services are a great business model. Rather than always try to find new clients and doing custom consulting, productized services allow you to charge a monthly fee for relatively standardized services that are easily outsourced.
WPTangerine offers unlimited WordPress editing for a monthly fee. This is a great business idea and can be done in many niches.
You don’t always need to be unique or first. This is the same idea that Dan Norris of WP Curve started many years ago. The company was sold to GoDaddy.
Almost every type of consulting or agency work could shift to a productized service model.