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what is the advantage of being as the witness? we get anything if we voting for someone?

Witnesses operate the servers that sign the blocks which create the blockchain, thus making up the backbone of the network. They also perform some other functions such as providing the price feed that values Steem Dollars. Finally they do a variety of other work to support and promote the Steem ecosystem, such as the design, development, and security analysis that @arhag mentioned in his post. If you want the system to work well and be supported with other efforts you should vote for witnesses who you trust to carry out these functions competently and honestly.

Hi @smooth,
He will get my witness vote for his contributions.
I will also vote for @rainman @liondani and @blocktrade
they had provide important information about the current situation with supercomputing on my post. Thank you all.