Well, regardless of the philosophical value of the view, it is a practice that deprives one of a vote that could be used to grow one's network. Unless you have enough SP to have a slider, you only get 10 votes a day before you have to let them recharge, so you get 10 the next day.
So, you can cast votes for yourself, and enjoy your $.02, or cast votes for others, and gain their gratitude and attention. Which is going to best improve your Steemit success?