Did Conte get sacked without comp?? First I've heard of that. He only had 6 months left on his deal anyway from what I remember.
In any case, I'm not really sure I buy this theory. We went for Ange in the first place partly because he was cheap, and coming from the SPL he had little leverage over his wage, certainly less than a Mourinho or Conte. This was by far the biggest job of his career and you'd have to think his salary would reflect that (Conte was on 17m, Ange only 4m per year iirc).
And I'm sure that Levy being who he is, and knowing that the average shelf-life of a manager under him is around 18 months, he'd have stipulated a pretty mediocre payoff were Ange to be sacked. Wouldn't surprise me if there were some clauses in his contract stipulating league position too, ie, if we're bottom half he only gets £2m or whatever.
When you compare all this to our lost revenues were we to finish in the bottom half, commercial and TV, it pales in comparison. I see no financial argument for keeping Postecoglou in post whatsoever.