AVB sacking proves top-flight management is losing proposition

I wouldn't want to be a manager of a top-flight ENGLISH FOOTBALL CLUB.
Take the case of ANDRÉ VILLAS-BOAS, for example.
He boasts the highest winning percentage of the past 13 TOTTENHAM managers and the club lies seventh in the PREMIER LEAGUE and have advanced in the EUROPA LEAGUE.
That wasn't enough. Spurs sacked Villas-Boas this morning after the top brass lost patience following a 5-0 home defeat to LIVERPOOL.
Villas-Boas became Spurs manager in July 2012, leading them to fifth in his first season.
He must be star-crossed, though. He was sacked by CHELSEA as well.
I can't imagine him getting another opportunity to lead a top-flight club, unless he is able to lead a Championship side into a promotion place.
Still, why would he want to manage in the Premier League again? It seems like a perpetually losing proposition.