You are correct in that there is a difference between living on state property and visiting it for whatever reason. (state fair or delivery examples I listed) However, in my book that just means that they should have more of an intrest in getting the state property law changed, instead of making life just that much more complicated.
And as I stated before this isn't just the poor that are affected. If you have to live on campus for any reason, you are also very often under the same exact restrictions. Very frustrating, especially in the married housing portion of campus living.