For one, you have to pay a senior developer to train them for a year plus before they'll really be productive. And secondly, there's not really a cost saving.

For one, you have to pay a senior developer to train them for a year plus before they'll really be productive. And secondly, there's not really a cost saving. If I hire a senior at $200,000 a year they're likely 10 times more productive than the boot camp grad I can hire at $80k a year or the offshore contractor I can hire at $20k a year. Plus that senior dev will be able to think about good architecture, team dynamics, bring industry experience, etc. Now I do think there is a place for hiring interns and new college graduates once your development org reaches a certain size or the company is at a certain level of stability.