Jabba is right that if a company wants to advertise on radio to Hispanics in the Atlanta market, it has to use WBZY-FM. La Raza, however, bills very well in Gwinnett County, where it's located.
Clear Channel's first Hispanic FM in Atlanta was on 105.3. However, that station soon moved to 105.7. CC management at the time understood that while 105.3 has a move powerful signal, it's located southwest of Atlanta, far from Gwinnett, the fastest growing county for Hispanics. And 105.7, while having a relatively weak signal, booms into Gwinnett. Then when Clear Channel decided the market couldn't support 2 Hispanic FM's, it killed Viva, the one on 105.7 (which had a format like the Mia 92.3 translator has now).
What Clear Channel should have done then was move the remaining Latino station to the 105.7 signal. But they left it on 105.3, in effect serving the Hispanic billings in the hotbed of Gwinnett on a silver platter to La Raza. I wrote multiple times in my blog that CC should switch the format on 105.3 with 105.7 (Wild 105.7 at the time). The Clear Channel Market Manager back then said she did not agree with me. The 105.3 signal is fine in Gwinnett in cars but otherwise weak.
Now it's more difficult to argue for the frequency swap because 105.7 carries an alternative format whose target is concentrated in the northern suburbs and therefore appropriate for that signal. But back to the original question: Ratings don't matter much for WBZY because they get on virtually every Atlanta Hispanic radio buy.