If Poch takes PSG, he can be seen to fail there, and probably still get a Spurs / Dortmund type job in the future. If Poch takes, say, Monaco, and is seen to fail, not only does he lock himself out of PSG / Real in the future, he also makes it harder to get a Spurs / Dortmund job too. But it definitely locks him out of the top table.
Talk of money...how much money does Jose make on every job? Because his record reads trophies, trophies, trophies, trophies, trophies. He can make an argument he hasn't failed anywhere, and can command £15M a year.
AVB could command £13M salary at Chelsea. He's now on £6M at Marseille. Managers make way more money if they are smart with their moves, if they elevate themselves into the top table, and get some perceived success under their belt. If they do it well, they make way more money over the course of their careers. Some of them back themselves and believe that is where they deserve to be, and will make the moves to get there. Again, not sure why this is a weird way of looking at things.