"Sequels are very rarely a good idea, and in any case, the success of the book changed my relationship with the club in some ways"

This quote by Nick Hornby recommends that sequels are not constantly a great concept, which the success of his book altered his relationship with the club in some method. It implies that the success of the book had a negative impact on his relationship with the club, as it might have triggered a rift between them. It could be that the club felt that the book was too revealing or that it depicted them in an unfavorable light. It might also be that the success of the book triggered the club to end up being more far-off from Hornby, as they might have felt that he was exploiting their story for his own gain. Whatever the case, it is clear that the success of the book had a significant impact on Hornby's relationship with the club.