In the 3 companies I've worked at where I worked closely with direct sales teams, the ones who beat their numbers stick around, the ones who don't get fired. Your salary is the base pay you get whether you clear your numbers or not.

It's weird to call that "expert opinion". I'm not an "expert" at managing sales teams, though I've hired salespeople in 2 companies (I've never done sales or managed a sales organization). But we're right now not so much discussing my opinions about direct sales as we are talking about basic facts.