One thing I discovered recently is that for GPU machines your initial limit on AWS is 0 (meaning you have to ask support before you start one for yourself)
(This might be an issue of my account though - having had only small bills so far)
(This might be an issue of my account though - having had only small bills so far)
They're likely doing it as a way to control demand spikes because they have such a smaller pool of GPU instances to go around. Also, it prevents Joe Schmo from wasting one to run a web server because he doesn't understand performance and "just picked the best one".