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setting up more witness accounts won't necessarily speed up the blockchain, besides, Steemit already has one of the fastest blockchains. If you set up multiple witness accounts I wouldn't expect many supporters of all of them. It may even have a negative impact on your reputation as a witness because then it seems like you are only after the witness rewards. Most if not all people will only vote for one of your witness accounts, assuming you are actually contributing to Steemit. If your plan is just to try and earn by capturing as many of the top 100 spots then you might want to learn more about what a witness actually does and what it is all about. All users have 30 votes and they won't waste them by voting on the same person multiple times.