I checked a few of the pools on the page (MPH, f2pool, 2miners) for their stales policy. MPH and 2miners don't say anything about it one way or another. F2pool indicates they don't pay stale shares.
On 2miners you can also get a rejected shares (stale). The difference is that 2miners always pay 100% for level1 stale shares. The ethereum blockchain reward stale work, so pools have a different definition of what a stale share is. On the 2miners pool you can get 100% accepted shares with --xintensity 512 and 0 stale shares, on crazypool you get ~5% stales. Miningpoolhub, f2pool,nanopool accept more shares. You can get a 5-10% higher poolspeed, and this will almost always lead to a higher profit.
Conflating uncle blocks and stale shares. Even if that were true, crazypool does find and pay out uncles.
It's the reward system on crazypool that is odd. Every miner that find an uncle block will get his work rejected(stale), and the profit from the work will be divided to the other miners that have more accepted shares. Uncleblocks are securing the ethereum blockchain, and if every miningsoftware and pool try to remove the reward , it could be dangerous.
