Why sh0uld we vote witness is there any benefits ?
Witness is someone who (voluntarily) takes care of the blockchain ecosystem.
In this case, we provide upvote to help them (indirectly), because after all the tools, electricity, energy, time, and thoughts that they use to maintain the ecosystem STEEM blockchain must be appreciated according to our abilities.
Well, because we cannot help with tools, electricity, energy, time or thought, at least we provide support in the form of upvote, so that they can continue to become Witness and get incentives from the STEEM network.