make it a once a day freeplay slot machine
I don't want to convert my service into another casino.
It's not a casino, it's just a site where you have a chance to win money for free; the way it is now it already depends on luck whether someone wins the big prize or not, i'm just proposing you rearrange a few things to make it feel more like luck and less like waiting for an important email to arrive.
by making it always reset at a predictable time, you reduce the time visitors will remain on the site
Opposite is better - by increasing time people staying on the website advertising become more effective.
Currently what reason does someone has to stay there for the remaining 22, 14 or whatever hours if they can't make any more money 'till the clock flips over?
update the page indicating when someone got the big prize
See Stats section.
I meant you should add a notification when someone has won recently in the page itself so people feel closer to the possibility of winning.
Now even when not winning people will still feel like they have chance and will keep playing
I think it is clearly stated on the website that you can receive only ONE prize per day and if requested have no more chance to win anything today.
I meant now as in, in the hypothetical situation where the changes i suggested are implemented.