I wouldnt be a fan of them in general and would rather have none on operation but since they do exist and are highly used i find myself using them to give my posts a boost at the start and more visibility.
I think that posts sitting on 0c really struggle to attract attention where as posts with ten dollars makes people more curious as to why so they look. I do post and try to add good content so for me its about attracting people to it but there are plenty out there just using the bots for profit.
Its not as much an issue now as i have regular followers and commenters so i never see 0c anymore but that took a while.