Blown motors happen, and the belly catch pans are only good for so much oil before it spills. Racers knowingly live with the risk but things still happen when jackholes forget, or fail to care enough to wire shit in. I've been considering the diaper pin/safety wire tether setup on our streetbikes just for peace of mind once we move to Intermediate trackdays. Just a good idea to ensure they'll not backout on the street too, and doesn't add THAT much hassle to oil changes. Plus it gives me an excuse to order some fancy pants predrilled color anodized drain plugs, caliper bolts, and fill plugs for our bikes