Due to the fact that there is nearly no population on Fantasia now...
and from what I observed on the server, the price ranged from 20-60m
I remember seeing couple ppl selling the world box pets
they kept lowering the price until around 20-30m and I believe the pet was sold around those prices
I'm guessing, if the pet you have is on the rare+popular end, its probablly near the higher end
This price is due to the lack of demand ( thus driving price down)
If your fuse book are free from event, go ahead and fuse the pets and sell them.
If you have to buy the book,,, you might as well just sell the points.. (bc you wont make much)