For me, gowing up, I enjoyed watching games with my pop way before the Blazers came into existence. I also played in school and city league at the Milwaukie Elks for years. I simply enjoy watching the athletes at HS/College & Pros. When the Blazers came around it was great and even went to games alone if I couldnt get anyone interested. Back then you really had to like the game to jump on board  and be a loyal fan. Of course when your team make the playoffs, it ramps up the enthusiasm and interest. There is nothing like winning a championship or advancing far and yeah it can be a bit anti climatic when a team goes through periods of losing and building as its so competitive. Look at how many fans support the Mariners but they haven't tasted playoffs in 20 years. I have friends that are Timberwolves's season ticket holders and its because they like basketball even with all the losing and rebuilding and ups and downs. SacTown still remains loyal to the team that has struggled for so many years. The Jazz have been close a number of times only to lose out but that city loves their sports. At all levels.
Yeah, sometimes the politics and bad management can piss me off about the game but it never has drowned out my interest in being a watching fan, win or lose. The game to me is more than just entertainment so if I dont like whats being played I dont stop watching like I will a tv show or movie.