B2L2

I have never been to any BMWCCBC, so I can't comment.  If you know you are getting 40-50 1-mins run in a day, that's very good deal that definitely recommended.  If it is just a guess, I think that number is on the very high side.

Price is similar to Velocity I and time you spent on driving is similar too.  That's nothing you could compare to a normal AutoX day where you only get 5-6 runs (that a good day already, compare to only 3 runs in a competition event).  A normal autox day is a not a practice event and you are there to win/lose.  That's why whoever went to Velocity class will say that it worths the money for just the seat/practice time

B2L2

Sounds good for $140 to go with the BMWCCBC event, especially all you want is to learn and drive.