Most of the time, the authors don't try this to get attention as, by default, the old fellows and the promoted members by some influencers always get more votes than the new users regardless of the post quality, though some big votes from appreciators and some curation chains like ocdb, curie, curangel are diversifying and voting the good contents always. So, I think there is still some nepotism in voting, but it is 100% fair, and they all have freedom and negative voting is also being used as rivals among the whales. So, grabbing attention in such a way is meaningless rather than posting good quality content, which will grab organic attention with increasing chances of getting more votes and getting trending.