The benefits of visualization of server is
For Better Management you can sit on your single pc and manage all of your virtual servers .
Better performance
Reduce Cost
I'm afraid I can't agree...
You can sit on your single PC and manage all your routerboards. even in unconfigured state (mac-telnet, mac-winbox, and even beter, RoMON). Guess you refer to the "hardware part" of the virtual servers.
I don't agree either on "better performance", there are limitations on 10G interfaces, and virtualized nics performance can be a bottleneck on x86 (that's why CHR was released), that is not speaking of IRQ bottlenecks...
Actually you don't reduce costs at all but very specific scenarios by using virtual x86. Additionally, routerboards are much more reliable than PC hardware, see the link on previous post.
It would be a different story (in terms of mid and long-term costs) if the system had to be housed on a NOC, where you usualy pay per rack space and power draw on a monthly basis. Again, that's why Cloud Hosted Router ROS version was released for.