Also, they will have only HVM Linux VMs, and last I checked paravirt Xen (what most AWS runs, probably also Linode, maybe DO) tends to be faster than HVM.
We're taking advantage of the $150 and staying within it, but once we go live we'll need to expand. We will definitely investigate that.
So if person A signs up for BizSpark, then can then invite x amount of people to their companies BizSpark account and the $150/month and MSDN etc. benefits are also given to those other people. So Person A, B, C, D, etc. will each have their own Bizspark/outlook/azure account and each gets $150 a month in credits, and each has their own ultimate msdn subscription for 3 years.