I don't think you get the point. RDS is expensive, just because you having pricing parity with it doesn't mean that you are going to be at the same pricing level as cheap hosting.
And thats fine, you have features on top that can be worth paying for certain customers and expenses of your own to pay. Those of us that have been around in this business for 30 years know how expensive PAAS and IAAS can be and how easy it is to roll your own solutions and when not to do that.