I understand it is complex but it should follow a logic though.
I did not have any drops after I sold a player but I had it this game, right after the ASG, and I feel like there is always some sort of (unplanned) drop in spectators' "enthusiasm" because of the FS update on Wednesday without any games being played.
Plus, it comes right after I got the lead in my league and if that does not fans... well, it is honestly weird.
Ultimately, I do not know if it takes into effect the hardness of the conference but it might be a good idea starting to consider it in both attendance calcs and weekly revenues for merch and TV contract as calculating them for the whole league is reductive since half of the teams in the other division in my league are constantly being reassigned and they have it easier than us in the league and can spend less during the season, bolster rosters in the last part of the season and even get to PO with higher TS... a fair system should take this into account, imho.