That's because you are a dedicated fan. "Too far" depends entirely on one's commitment and passion for a team. Those two factors determine whether you can afford a game, are willing to drive "x" distance, etc. It's all cost benefit analysis.
Your desire to see a game is based off of your love for the team and willingness to support them. That desire varies person to person and establishes an intrinsic value of a game in one's mind. It's just a price-check after that. Is the value of your benefit of attending a game greater than or equal to the monetary cost of attending said game?
Answer is yes for me, as well. 1.5 hr drive.