You mean they won't happen on Joeblow's home gaming PC because no one gives a shit, everyone is an Admin anyway, and there's not a whole lot to hide that you can't see already so who cares? But for locked down security appliances and vmhosts, it is potentially very lucrative. Being able to jump from a public webserver VM to a private file server VM or mine information from that VM without any networking linking the two is pretty huge, or even just breaking open some credit union's sonicwall or pfsense box to access banking records.