I asked a similar question via PM after reading the sticky. I've attended three rallycrosses in the past 6 months, and so far no damage has occurred. I have found dust and dirt in even the most enclosed spaces, so be sure to keep things well lubed and clean after each race. And the way I see it, if I blow a strut, it's a way to talk my wife into letting me buy coilovers.
Originally Posted by Ozymandias
a roll over will almost never happen at a rallycross. the course design and safety stewards there won't allow the possibility. if they think that a car would be close to rolling at a spot they will change the course.
now with regards to suspension, it can be hard on it. it mostly depends upon your driving style and how hard you intend on pushing. some people, myself included, will drive through anything with little regard for how big of a bump it is, and some others will go easier. you can possibly bottom a suspension by cornering hard and hitting a dip, but if damage or fear or it is a big concern just take it a little easier in those spots. i probably wouldn't go if your suspension was lowered though.
a rally cross isn't hardly dangerous at all to competitor or car. the part about repairs i suppose is mostly a disclaimer. it is racing and you can damage some suspension bits or tires if driven hard. but i have experienced more damage to my car from rocks, potholes, cattleguards and other daily driving than from a rally cross.
watkins is a great course, especially for someone's first time. at the very least show up and see if you think the course will suit you. if it does enter.
the colorado rally guys are amazing. i think you'ld have fun. look especially for rupert or ken.