i think that running a exchange is a very active job... i believe that the owner of Yobit , c cex , bitrex is spending the whole day on his exchange
I think yes, although there are bot,scrypt or another proggram for it. But sometime they can be error and the owner or administrators must be ready for services costumers who trade on there.
i don't think this is true about yobit but when you start an exchange service and running a big service with lots of customers you start it with a team of developers and support team to handle all the things from developing, security against hacks and exploits, maintaining the wallets,... but it is never a full day job. all the work is being done by the programs not people.
besides it is a lot of money, you should be working your ass of to protect it.