Probably shouldn't talk about it, but in ~25 races last year and one this year, I've seen/heard about 10 crashes, seen two ambulances called, but have stayed upright. So far.
I'm not so worried about hitting the deck - it's more about being run over by 30+ bikes afterwards....
Had one close call in a crit last year, final straightaway and a guy trying to sprint (head down) hits a road turtle and goes down, bringing the guy behind him down. I go to the side, and so does one of their bikes - I did a mini-bunny-hop off his front tire as the bike was sliding across the ground, and finished the sprint (for 15th).