How will you provide high quality service and reliability while competing on price with the scale and financial might of AWS?

Because in B2B, those things tend to have a higher value than initial cost. Or to put it another way, your customers will be making long term investments by choosing you.

Successfully competing on price in a commodity market requires cheaper access to resources and because price is the easiest way to segment a market, low prices attract price sensitive customers...they are the least desirable customers. Good luck.