Yes, computing resources, including computing power, memory usage and storage are limiting factors and they do increase cost. One instance - who cares. 1000 instances and you might care. Something you ship for other people to run? End users might care.

Give me ssh, and I can deploy my app to default installation setup in a second, like CentOS 6. That includes binary transfer, installation and startup.

Hot deploy is nice. Sadly Golang is one of the only language environments where you just can't do it. Do watch out, the issues you'll encounter may be rather unique. Especially when applied in production...