I'd imagine on the whole due to cost. Heroku, for example, is a great stack, but costs a significant amount if you aren't flush with cash. This can be run on a

I'd imagine on the whole due to cost. Heroku, for example, is a great stack, but costs a significant amount if you aren't flush with cash. This can be run on a small ec2 instance for a fraction of the cost, whilst it does have greater administrative overhead.