This page now says the following that is relevant to this topic:
Entry Fees
Entry fees for our regular autocross events are $30 for all. Special events may be more. The entry fee pays for your driving as a participant in the event. Some of you may have heard about our world-famous lunch. That lunch comes complimentary with your entry. Guests may attend for free. If you bring a guest, and they want to share the lunch we provide to paid participants, we do ask that they pay $5.00 to cover the cost.
Lunch
The lunch we provide is complimentary with a paid entry. Whether you choose to share the lunch or bring your own, the entry fee for driving as a participant is $30. The lunch we order is often pizza or sandwiches of some type. We understand that some of our participants may have special diets, and we don’t mind trying to meet your needs if the request is reasonable. If you have dietary needs, please include a note to the registrar when you register or send us an email, so we know in advance, and can let you know if we can meet your needs, or not. However, we may not be able to meet everyone’s needs. If you have any concern at all, it would probably be best if you plan to provide your own meal for the event.
I guess the important parts are that there is no fee discount if you don't eat. If your diet is of importance to you - plan to provide for yourself. And, if you let us know ahead of time, we can try to help you out. Want just plain cheese pizza - tell us. Need a vege sub sammich, we can do that. But only if we know. If you wait until the event, it's a done deal and there's nothing we will do at that point. We're reasonable, we ask that you be, too.

And for what it's worth - I've recently discovered that one of my many allergies is wheat. So, you know what? No pizza for me. No sammiches for me. The last two events, I packed my own lunch. And it's ok. One day, if I'm in the mood, I may ask for a salad instead of a sammich...we'll see...