Actually, Hammerjaw and Glacian being removed from locked crates WILL make Singe and Samael cheaper, because they will cause an increase in supply of those pets. Increasing the supply of any item results in prices dropping. Additionally, there is a new arcane pet coming soon, and if that pet is better than Singe and Samael, then that will cause there to be less demand for those 2 pets, which will also result in a price drop.