Yes, mixed incentives. From a strategic point of view, showing slightly positive poll results could motivate campaign workers and donors. (To give their time and money because it’s not a lost cause.)

Showing slightly negative results could motivate voters to get to the polls. (They might stay home if they’re lazy and think they’ll win anyway.) 

I honestly believe that this election comes down to which party cheats better. There are probably a few key counties where stuffing a few ballots would flip the state. I would think they would have the data to know where to focus their efforts.