Choice Privileges - Difference between an "SOS" and "VIP" rates?

The Counselors' rate shows as a "Significant Organization Savings" rate on our screen when the code is populated, like LPGA and Little League. I think the sage soitgoes taught us about these a while back. Now, the GEICO rate, which can only be got over the phone, shows as a "VIP" rate, at least when the reservationists see it, so they say after looking at my past reservations to see what I'm asking for again. The only obvious difference is about $4-$7, advantage:VIP (most of the time), in my experience. Otherwise, the difference is transparent to our side of the counter.

Can the sages give any more background as to these categories in the Choice scheme of things? peggle? Thank you. :)

"Usually around $5-$10," per a reservationist. "And usually more time to find what you're talking about."