Tex, it was an easy decision really.  I wasn't able to ride frequently enough to progress to the level I wanted to be at.  Each time out was more frustrating than the one before.  I ended up having a big crash over a tabletop I've hit a hundred times.  I didn't get hurt, but slightly different circumstances and I might not be typing this right now.  Lost my nerve.  My kids also lost interest.  Bottom line - it stopped being fun and became a hassle for me.  Still love 2-wheelers though, but will be riding a VTR1000 Superhawk instead.