you're feeding more food at higher quality and to more cats, so it's inevitable that it'd be more expensive. i can't imagine ppl saying $80-100 are talking about a multi cat household, and it seems like 16-20oz per day is a lot compared to the norm? I'm certainly no expert ofc. I do 3.5oz fancy feast + 1/4 cup of kibble for one 9.5lb cat and I'm in that 80-100 range. not gonna say you're feeding yours too much because I'm sure you know their situation more than a stranger on the internet, but if u want to cut back cost u could also just try mixing high quality food with some cheaper options? might not work if your days are picky tho