Per the thread at https://www.reddit.com/r/renandstimpy/s/PQI91AFOkm here are some images of notes from Teletoon showing they did not seem to have an eye towards an adult audience for the Ripping Friends.
A recent thread ( https://www.reddit.com/r/AnimationCels/s/m0zgS29RGm ) was decrying the increase in prices at places like the Cricket Gallery in the last 15-20 years. I brought up that prices are less now than in the early ‘90s. Here is a relevant page from a 1994 Cricket Gallery catalog, and some of their current gallery listings. Note the other thread was not wrong about prices 14-20 years ago, which were much lower than now or 30 years ago. Keep in mind that inflation means those 1994 prices are about 2.2 times their apparent price in adjusted dollars. You can see that prices are less now than 1994 even in unadjusted dollars, meaning they’re less than half in inflation adjusted dollars. They are also largely less iconic images.
This doesn’t alter whether they are worth current prices to any given individual, I’m just providing the receipts for pointing out prices are down over past times (semi literally; I own one of the pictured 1994 cels).
You can’t trust the apparent price on eBay “or best offer” entries, but the actual auctions and Discogs sales seem to have settled around $600. 13 sales; assuming they’re all unique about 5% of what was available.