I think a major difference between this track day and others is the majority of the people that showed up brought old beat up ex race bikes so the prospect of going down wasn't as big of a risk. Most track days I'm at are a mix of race bikes and very clean street bikes. It's a lot more expensive to wreck a brand new street trim 1199 than an untitled 2003 GSXR 750 in race plastics that has already been wrecked 2x before. I do have to admit, this makes me a little more likely to go out in the rain and was my original mentality back when I bought my gixxer. However, now, after "been there done that" I'll stay in. It is a personal choice for sure though because you are definitely taking a risk. I agree on one hand that a little wet experience will make you a much better rider and it certainly has me, however, I personally don't have a lot of fun running around in the wet with my ass puckered going slow. I'd much rather ride in the dry and put a knee puck to the ground so at this point I'd stay in, because I don't have fun in the rain, and I don't want to take the risk of a damaged bike or personal injury when I'm not even going to have fun riding. After all to me track days are about fun, but I'm not a racer.