To be honest, isn't it the same run of the mill clubs doing the roundabout of the same run of the mill managers? Occasionally one gets a better job and screws up. It's the leagues within leagues principle.
It costs a country's GDP to enter the 'big five/six' and be at the top. Next you've the survivors - Expensive, and they lose money striving. Then you've got the yo-yo's. A lot of us on here would suggest that is what Ashley has done to NUFC because get it right and you make a lot of money.
Really, these managers are on this same gravy train. Look at the current bottom five; managed in declining order by Moyes, now Hughes, Hodgson, Lambert and finally Pardew.