Yeah that’s what i mean 10 million allowed requests = $50 - it’s still a variable cost.
example if 25,000 unique ips make only 1 request/s per unique ip to a matching rate limit rule url = 25,000 requests/s over 1hr = 90 million requests/hr and if rate limit was even 10 requests/s per unique ip, all 90 million allowed requests would be billable as far as i understand it so that could cost US$450 as per https://support.cloudflare.com/hc/en-us/articles/115000272247-Billing-for-Cloudflare-Rate-Limiting