No. I have smart pricing turned off, but I turned it on to check what the minimum price was and it was set to the same $500. I turned it back off.
One additional piece of information, I have only booked 3 reservations so far, so I believe smart pricing is willing to price under the minimum to help get me some bookings and reviews. I don't know if that makes a difference (I don't see why it would, or why March would change anything, especially since I have smart pricing turned off and the price change in March is an increase), but I mention it to help with this conundrum.
Scott