Any Tom Dick or Harry can go buy a quad and take up "quad riding" with little or NO experience. This is where many of the quad accidents come from. Beginners riding outside of their skill set. 3 Wheelers on the other hand, as far as I can tell, are becoming a very niche small experienced group. If someone is getting started into ATV riding, chances are probably 99.99% they will go buy a quad rather than an old used trike. The people still riding trikes these days for the most part are very experienced with them, thus many less accidents on trikes. Just my opinion, but the skill set VS what are you riding makes a big difference. Normally schmucks ride quads, and purist manly men ride trikes.
RIP - Yamahondaman!! You will never be forgotten!
RIP - Sam Brehm!! Gone but NEVER forgotten!
RIP - Sandpuppi101 - You will live on in my mind - I miss you friend!