Edukator – yes, snowboardcross.
Regarding angle of slopes for avalanche danger, there is a risk of avalanche on any slope steeper than 25°, with the risk increasing to a maximum at around 38° then starting to drop off as slopes become too steep for snow to accumulate. Below 25°, they are virtually unheard-of (occasional very slow moving wet snow avalanches occur down to 20°).
Avalanche accidents in the European Alps at slope angles less than 30° are incredibly rare. All of the accidents which have occured so far this winter have been on slopes steeper than 30°.
See here for more detailed stats: http://www.slf.ch/schneeinfo/zusatzinfos/interpretationshilfe/info_gefahrenstellen/index_EN
In terms of skiing/snowboarding, 30° is about the angle of a steep piste, i.e. a Black run or a steep section of a Red. In soft snow off-piste, we tend to ride steeper slopes. 30° is still steep enough to be fun though.