Hey Don, the $4,000,000 for the ballpark doesn't come from the $100M for your roster. Taken from Page 1:
"For purposes of calculating a cumulative salary for draft order, all ballparks will be given an arbitrary salary of $4 million. Since it’s is assumed that anybody that wants to pick a ballpark early, must value the park highly. Obviously, this salary doesn’t count as part as your $100M team salary cap."
Cumulative - $96,025,040