Well for parameters I think it is going off statistics for the country or state.
This is generally thought of as:
The median income (middle class) varies by state, as of 2009 it varied as much as $36k-69k depending on what state you lived in. I think that's why it didn't give parameters. It's more or less asking, "At my station in life and where I'm at, am I poor, rich, or in between?"
Still it does seem to be a very vague question, but I get why it is.
Anyways about the content. I would like stuff that was brewing/distilling related and themed. I haven't seen much decor around that stuff, but I would be interested. Anyone seen any?