No, it's ok. Frankly, I'd forgotten, but I'd been told this when I applied to Berkeley years ago--no one local graduated in less than 5 years, and those paying full tuition got top priority for class placement.
So, to clarify, are we talking about students who aren't on financial aid and paying full freight, or are they students who are OOS and paying a premium above regular tuition?
This registering for classes in the summer is so foreign to me. I went to private school, and we spent the first week or two of the quarter "shopping around" for classes. I can't remember when the registration deadline was, but it didn't really matter because we had until the day of the final to drop the class without penalty. And with the exception of certain very popular classes (mostly fun electives like SCUBA or sex ed), there was always room to take any class I wanted.