Why's Gold Ball Draw's jackpot $(69 - 2B) million?

[scherz0]

Quote Since 30−B balls have already been drawn, this jackpot is $(69−2B)million.   As per the link overhead, the jackpot increases by $2E6 for every ball removed, I know. But where did this(69−2B) stem from? I feel like the author, Paul Sinclair, pulled it out of a hat!  The maximum Gold Ball Draw jackpot is $68E6, not $69E6. Then why did Paul Sinclair write 69?

 

Edited June 2 by scherz0

[swansont]

What is B?