Actually, the poverty line as established by the Federal Government is set at much lower than $30,000, but it does very by household size.
Now, just to be difficult, let me ask the following question. How do we know that $36,000 per year is not rich? My point is, that it seems that we are running into the problem of determining who is rich subjectively. And our subjective definition of rich, never includes ourselves. Perhaps there should be an objective definition of rich, we might not fare so well under that measurement.
For example, someone earning $36,000 per year is probably richer than many of the rich people during the time of Jesus. So if we were to measure who is rich objectively, should we consider living standards in our generation or previous generations?