Well known != well solved. It's the difference between "we need to build a web application to do X" and "we're going to redefine how people do X".
Secondly have you seen Salesforce? The COTS solution isn't zero configuration in many cases. Plus many businesses decide their unique selling point can be having bespoke software that has a feature that the COTS version can't do, or do as well.
I've just spent 3 years using SCRUM to build a CRM system after my employer decided not to go with Salesforce because they wanted everything to match up to how we do things. Plenty of other firms in our industry are extremely jealous of what we've produced because it is domain specific rather than over generalised.
Secondly have you seen Salesforce? The COTS solution isn't zero configuration in many cases. Plus many businesses decide their unique selling point can be having bespoke software that has a feature that the COTS version can't do, or do as well.
I've just spent 3 years using SCRUM to build a CRM system after my employer decided not to go with Salesforce because they wanted everything to match up to how we do things. Plenty of other firms in our industry are extremely jealous of what we've produced because it is domain specific rather than over generalised.