Comp is based on THEO not actual win/loss - though a host can look at your play and step in with an exception if you had a quick loss.
Some casinos (in Australia) used to have a quick loss comp for those crazy players that would wash through several thousand in a few minutes that would be an accelerated comp level.
All that matters in the Borgata, or anywhere really in the US if you are relying purely on the automated comp system is THEO.
Formula is:
Average Bet X Hours Played X Game Edge / Point System
Therefore:
A person playing BJ will earn less than a person playing Casino Stud Poker (if the Bet and the Time are equal)
A Person losing 3K in 1hr at $100 average bet on BJ will earn 50% of the comp of a person breaking even for 1hr at $200 average bet.
Borgata's point system is tougher than the other casinos for sure - so playing the same averages in Harrahs etc will likely earn you more comp there than it would at the Borgata.
For example last week I played an Average bet of $500 for 30mins of BJ at Borgata and earned $8 comp dollars...