I just came to the forum to report the exact same issue. My responses are reporting a VERY good cache hit rate (like 93%), but in my billing dashboard almost nothing is going to the caching category. NOT none - but like 3 cents.
Good to hear I’m not crazy. Been doubting my math for the past 30 minutes.
(Would be really great to get that cost reimbursed! I’m racking up quite the bill right now, lol.)