Since you are in drawing curves, also draw one for the profitability of a normal XMR miner and a 100x XMR miner... yes, very fair and unsuspicious for everyone involved.
There was likely never a 100x advantage. The 100x was the
maximum advantage dga reported from start to finish, but the public miner got faster as well over the same period of time.
Nevertheless you can actually compute the potential value of it by looking at the total number of coins produced during that period. That is a maximum, and not a very good estimate because there were certainly non-advantaged miners during that period. It still isn't much.