Thanks for your comments. The payout timing is based upon several factors:
- Exchanges require time to process withdrawals, and then additional time is required for the blockchains to confirm the withdrawals to our wallets.
- If we paid out every hour, we would spend too much on transaction fees to remain profitable. Some customers have also complained about hourly payouts because such frequent payouts mean that they themselves would have to pay higher transaction fees when they spend the money.
- We are a pay-per-share pool, so we don't always have enough money available in the morning to pay all miners on unlucky days. Infrequently, when there isn't enough money available, we need to pull money from our bank accounts to pay miners, and that takes time.
We try every day to issue payouts as early as possible, but only guarantee that payouts will occur sometime during the following day. Hopefully this answers your question.
In regards to the current profitability, we used to display current profitability until October 2014. Current profitability is not very meaningful, because it changes many times per second. When a very profitable coin becomes available, current profitability can rise above $1, and then fall back to a few cents two seconds later as the difficulty of that coin increases. The figure became misleading to customers because if someone visited during one of these periodic bonanzas, it would look like they had the potential to make that much money all day. This "current profitability" figure is provided by our API, if you are interested.
When we realized that current profitability was misleading, we then tried to compute average profitability over the past 15 minutes. Unfortunately, we quickly discovered that it takes as long as five minutes to compute that value, so the database was under heavy load and the value was only available 2/3 of the time. Therefore, we decided in the end that a daily profitability figure was the best balance between accuracy, performance, and avoiding the misleading of miners.
Feel free to ask if you have any further questions.