> I see a lot of startups creating internal software themselves (e.g., CRM's, email marketing systems, etc.) with a similar rationale based on "values and principles", where an off-the-shelf solution would be a much better use of resources.

I've also seen companies drown themselves in custom ERP systems to the extent that it actually impacts their bottom line.

Point is - if these types of projects can produce an ROI and improve the bottom line, then by all means do them. But know what you're good at - and better, know what you're not good at.