What will happen to the Lost Desert Plot Prize Prices?

I have bought one of everything i could find on the shop wizard. I am sure i spent too much for these.

Handful of Sand
Ahn Key Ring
Ben Key Ring
Djo Key Ring
Fer Key Ring
Kar Key Ring
Kha Key Ring
Lat Key Ring
Nem Key Ring
Ra Key Ring
Saf Key Ring
Set Key Ring
Tep Key Ring
E-Z See Crystal Ball
Nuria Statue Bobblehead
Spike Pit Play Set
Useful Crystal
Gelatinous Non-Cube Plushie
Nabile Plushie
Stylish Scroll Rack
Foreman Cudgel

The other items are all in the trading post.