It said "月商 (Gesshou)", which means monthly income/monthly revenue, not viewers.
If we look back to when we were shown Rika's bank account, it said 80 million Yen. By a rough calculation, this means the Momonga Account had been running for 8 months by the time of the Matsuo Jin arc. If we calculate up to the current point, it means the Momonga account has been active for almost 1 year, maybe more.
Rushed day, but something about your comment really stuck to me, and i don't know why. Now i do. There are 2 nuances that i overlook earlier:
Nuance 1: there's no reason to believe the money she lent to Matsuo Jin wasn't taken from Momonga's income.
Nuance 2: there's no reason to believe Momonga didn't start with the 10 million yen monthly revenue, it just grew to that.
If we go with both, then Momonga has been around for more than a year. Matsuo even mentions how he met Rika at the PTA, about a year before, so it should have had enough revenue for a 10M Yen loan. But here's what my logic kept beeping:
If she had a little more than 80 Million yen at chapter 10( really close to the school festival arc);
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If Mukola is right about the school festival happening in October( the 10 month);
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If so, then the 10M yen revenue started coming from, at least( best case scenario) between january(01) or february(02);
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Rika approached Shingo as they were both in the PTA, their children were friends and all...but it was after the school year began, so at most in April( 4 month);
=
It doesn't take a genius to figure that Shingo wasn't Rika's first affair partner in this account. Not surprising, but really not much of breach to think about it until now.
Nuance 3: even if he decides to take the fall, there's no proof that Iwabuchi would'be her initial AP. The authors could throw a new character here, or roundabout other one.
If i'm right, that means she advisory Shiratori as a side job to also acquire more cash and potentially invest in Momonga on the long run( specially to cover costs from the loan, and guarantee a better cash flow). And Mukola's logic turned out wrong, because it was the opposite: it wasn't Shingo with a body double. Rather, it was Rika with 2 or more APs in Momonga.
What a truly marvelous. She sells disgraced lust, sometimes solutions or salvation, just to make her victims fall into her schemes in the most ruthless manner. But what a splendid businesswoman she is in doing so!