Ero has been making over 7k per month since Jan 21, ironically his money doubled when he started producing more H animations on a regular basis. A good site to see how much he earns is hereI haven't checked their patreon in forever...last time I checked it, it was at $7,000...so I thought you made a typo.
Went to check and see and yep...they really are making $17,000 a month.
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Patreon take a cut, then the bank transfer fee and some Gov tax dept's have spotted Patreon (e.g. Sales Tax). So the money won't go just to him, then he has to pay animators. But probably 10k in his pocket currently, probably up to him if he wants to pay income tax. Nice wage but he does have the potential problem of more motivated competition in the future. For example that Holy Knight Ricca game was built on a similiar structure and seemingly quick development.
TBH I'm less bothered about the income but about what the game is planned to be; 5 levels, 20 enemies, 50 animations etc. Ero keeps it all mysterious and implies more.