Ticket fee is per Kb.
A block currently has just over 500 bytes, so the price placed to fee, isn't the amount that will be discounted from your prize.
If you set a 1.5DCR ticket fee, you will actually pay a little over half that, around 0.85DCR.
For pool tickets. For solo tickets its actually about 298 bytes so a 1.5dcr fee costs about 0.5 dcr per ticket.