Under such conditions the pool fee is whatever the pool desires and miners have actually no way of telling how much it is, regardless of what the pool officially says it is.
Of course no, I didn't say that. The Hashrate showed by a miner shown how much hashes that your rigs can run per second. But while you on pooled mining, many factors will affect (as I say above).
Value of shares between miners with weak and powerful Hashrate will different, and it will be modified by the difficulty assigned. Let's say five (5) shares, it can be one (1) prove-of-work in diff five (5) for miners with powerful Hashrate nor five (5) prove-of-work in diff one (1) for miners with weak Hashrate, and so on.