Yes they do - as said above, taking their manager a month into last season is one thing, but pinching a dozen backroom staff as well, including the club legend / fan favourite who was groomed to be the next manager (Bruno Saltor) was another.
And their chairman/owner Tony Bloom is magnificently cold-blooded about holding grudges if he ever gets f**ked over. Gets even, not angry. He's adored by their fans - can't think of many other club owners you can say that about.