A few other things to consider when building your own (from my experience):
Documentation - What happens when a new hire is added to the project? Can they get up to speed quickly? If a developer runs into an issue where can they find answers or technical details about the software? If you don't have documentation what will happen when a key developer leaves taking all the knowledge of the system with them?
Maintenance - Do you have the resources to support the software and maintain it?
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A few other things to consider when building your own (from my experience):
Documentation - What happens when a new hire is added to the project? Can they get up to speed quickly? If a developer runs into an issue where can they find answers or technical details about the software? If you don't have documentation what will happen when a key developer leaves taking all the knowledge of the system with them?
Maintenance - Do you have the resources to support the software and maintain it?