Isn't it basically the same as paying dust to crypto exchanges when making a transaction - it's so miniscule that it's not worth caring about?
replyWell the system prompt is probably permanently cached.
replyTakes up a portion of the context window, though
replyAnd the beginning of the context window gets more attention, right?
replyOn API pricing you still pay 10% of the input token price on cache reads. Not sure if the subscription limits count this though.
replyAnd of course all conversations now have to compact 80 tokens earlier, and are marginally worse (since results get worse the more stuff is in the context)