Recently coming out of stealth mode Heyday.co is a company that is buying fulfillment by Amazon and consulting for Amazon based store fronts. This is the future of marketing and consulting services on e-commerece. My prediction (please note that humans are horrible about predicting the future) is that there will be a influx of companies promoting and selling services strictly for Amazon Optimization versus the current trend of SEO's from around the world selling their services.
Heyday.co is going to lead the way and with a new funding round you will hear about more services like this.