Totally disagree from the user's perspective. Every time I try and use Quora for technical reasons, the answers are almost always people selling their product and not offering a constructive solution to the problem asked.

Sure, if the problem is unsolved then it is appropriate. But more often than not, this kind of advertising drowns out actually useful answers. Not least because their 'walk the dinosaur' narrative construction disguises that they are ads until you've read the whole thing.