Unless there is a follow wheel car, you have wheels in it, and you have 2 or 3 super strong and loyal teammates, your race for a placing is over if you get a flat.
So, it comes down to how lucky you feel vs how long you are willing to wait for a ride back to the start. It could be hours depending on how staffed up the race is so, a tube, a tire lever and a co2 in a pocket is not a bad call.
You wont lose the race because of the extra 275 grams in a pocket. On the other hand, you might win the next race is you do a 30 mile solo ride after your flat 