The service allows you to omit the ``Tiers`` parameter in which case it will use the defaults described in the doc string, e.g. name="WebServer", type="Standard", version="1.0".  Or you can supply name="Worker", type="SQS/HTTP", version="1.0" and get a worker environment.

I could default the kwargs to the defaults specified by the service but then it would actually pass the Tier param explicitly rather than not passing it and accepting the service defaults.  I was concerned that the service may then change the default behavior and we would get out of sync.

So, I guess I kind of wanted to leave the default behavior as *send no Tier param* so that we could be sure that default behavior was correct.

Does that make sense?