it's per month, another useful tool for calculation ROI is http://www.posmaster.info/
Actually, I think it's per ticket with no reference to the time period.
If the ticket takes 1 month to vote, then it also happens to be per month but you can't know that.
It has 50% chance to vote within a month and must vote within 6 months ore expire.
This is a return of 2.27 percent. With continuous buying, this value works out to be return per month. With at least ~100 tickets you can expect to see this return each month. Fewer tickets will still average to this value each month over time, but you will see increased variation on a month-to-month basis.
So what is it?
