Full followers of Catharism were known as 'Perfects'. They would commit to a specific ascetic lifestyle, and would on their death ascend to heaven. otherOther lesser followers of Catharism would be reincarnated to get another chance.
Unfortunately to be a Perfect, you need to be inducted by another Perfect. Since there are no more Perfects, no-one can become one. The last leader of the Cathar movement fully admitted that he was not a full perfectPerfect, because no Perfects remained to induct him. Therefore Catharism has effectively died out.
The Perfect Heresy by Stephan O'Shea is a good book for those wanting to know more.