Without knowing anything about the track or the membership specifics, I would say that $1,000 for a season pass is a great deal. I'd jump at it if I were in the area and qualified. $2,400 would require a bit more thought.
Do you have track experience? Not clear based upon your post. You'll never enjoy your M more than on a road course.
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M4 GTS, GT3, C63 S | E90 M3s, E39 M5
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