This might have more to do with the way poolpicker calculates or perhaps is even led to arrive at its daily numbers. For example poolpicker for quite some time lists coinking as the top choice in SHA-256 section, however as far as I'm aware coinking isn't actually paying dailies for BTC mining. And without actually issuing daily balance payouts for BTC mining the pool couldn't possibly reach its poolpicker listed daily SHA-256 payout figures. I know this first hand as I run one asic miner for few days to coinking's sha256 pool and my account hasn't been paid for those few days of BTC mining for about a month now, with payment estimate figure in dashboard mysteriously shrinking every day to now a fraction of the original estimate. Several posters here confirmed they had similar experience with that pool, we even posed the question to the owner or one of the owners of coinking on this forum and he chose not to answer any of us.
So either poolpicker base the estimates on numbers released specifically for them by pools, rather than actual mining, or maybe some pools are clever enough to pay little differently to the right account in order to make daily statistics look a little better. Obviously this is purely my speculation.
I agree with middlecoin being in auto pilot mode at the moment, it took forever for my test run balance to move from "Immature Unexchanged" to "Unexchanged" field and nothing moved any further for days. Looking through the stats you can clearly see payments are being issued daily at 2:30 in the night, but it looks like exchanging mechanism (rather than payout) triggers only if address balance is high enough (probably around 0.01 BTC). I always have a dedicated test rig pointed at the pool before committing to a larger scale mining - and I've seen this abandoned/auto pilot mode many times - p2pool.org has few coins with active users but last payouts 4 or 5 weeks ago, couple of my test runs on mega multi pool vanished into black hole, although, to be fair, some coins/pools have such scarce traffic that it might be just some verification issue or unmaintained setup stuck on preforked settings or similar. I just presume most of those pools are some sort of student ventures set up in dorms that remain abandoned until school year starts or something.