USTA isn't the Universe, either, and a USTA rating has relevance only in the USA
You may be aware that there are a number of other countries in the world in which tennis is also played.
There are also a rather large number of posters on this forum who hail from these selfsame countries.
With this in mind, might I respectfully suggest many of these people, myslef included, assign themselves a USTA rating for convenience when discussing tennis on these boards. We can be pretty accurate as there are some very precise and detailed international rating systems that allow us to convert our ratings.
So, if I say I am a 5.0, it is because I KNOW that my ITN 4 rating directly corresponds to USTA 5.0, I'm not making it up, and I don't need to be in a USTA computer to prove it..
Similarly, if some Dutch guy plays at Dutch level 6, he isn't guessing when he says he is 'about a 4.0'
There are more things in heaven and earth, Cindysphinx, than are dreamt of in your USTA computer...