So you think doing less than 1%, an insignificant amount, is not leeching? Even if they're "trying", doing that much is obvious that their gear/skills are no where near where they need to be to complete the run. The only real argument op has is that there won't be as many of these "noobs" who can't do 1% joining but if you look at the screenshot they got 10th. That's 9 other people who were able to do 1%. I don't think its that hard to replace one person to start the RaR.
Below 1% is leeching.