Let me try and explain my viewpoint, others I'm sure will have their own. When they post shit that is 1 post for people to read, when you reply that's 3 chances for people to read, the original post, your post that quotes their original post and then your post itself. If 2 people respond that 6 chances for people to read. If 3 people respond that 9 chances. Then we have the back and forth, that raises the chance of the original shit being read by multiples. If the concern is people reading their shit posts then the best result is not to increase the chances of people reading their shit.
As for incentive I am sure that they post in part to elicit a response, by having zero responses then at least that portion of the incentive is removed.
Always a Bulldog