It's just really hard to get through. Remember, KROQ is the most popular English language radio station in Souther California, so there are a number of people listening.
I have a friend though, who has won numerous things from them. I'm still trying to figure out how he does it.
It is just a matter of calling at exactly the right moment, when a line opens. Just stupid blind luck. Although, the Hardest Game Ever, this morning was quite amusing.
Update: My staff member, who is helping me to call, was just now caller 18! OUCH!