[ksnsnsj]

I have read this argument before. Of cause you can do everything yourself _but it is not free_

You are missing both development cost and much more importantly opportunity cost

If I spent a person year on a cheap run architecture while my competitor spent a person year on a value add feature add, he will win

[cuu508]

Depends on what skills you have, but running everything on a single machine rather than messing with multiple cloud services can also be cheaper in development cost.