there are a couple of reasons skiing halfpipe has not become an olympic sport.  one reason is,  to be qualified for the olympics, there needs to be a certain amount of countries competing.  there arent enough countrys with profesional pipe skiers yet.  another reason is the olympics comittee sees skiing as racing.  they see snowboarding as a newschooler sport.  soon, they willl come around to seeing skiing liike that too and skiing will become a part of olympics.