Hmm... What day would you begin betting? Could somebody send you coins at any given time to join the pool or are you going to have set trading intervals with new accounts starting at zero every time. I could consider this is done correctly.
Yes it will be intervals for 24 hours, the next 24 and so on. Shares for multiple days will be divided too. 50% for day 1 + 25% of day 2 (if there are more investors) and so on, i've taken that that into consideration.