I very nearly pulled the trigger on Pacers-Thunder game 7 for $1100, and I wish I had in hindsight. That's a big number, but regionally appropriate for a championship-deciding game. I don't know if you could get into any MSG playoff game for that price.
I don't doubt that some of the super rich Knicks fans are legit die-hard fans, but the pricing for those games combined with the Bad Vibes Man attending game 3 probably had an impact.