As stated so many times, inventory management is a mystery noone is even attempting to solve. It all depends on loads as the date of travel nears. You may be lucky to see similar (probably higher) rates but nothing is guaranteed. My suggestion would be to wait a few days as H fares do not sell as quickly (but check the loads - if the fligth is almost sold out you have to buy now). If you end up buying at the given rate keep checking the prices as they may go down later, at which point you can get a refund (voucher) for the difference.