Sell things you know that are in surplus, like ursei's, werewolfs, fictasu's, ect. Chances are you could sell them for a little higher then buy from people who are selling them for lower.
I did once upon a time on a site far away. I still have quite the treasure trove on that site. It doesn't hold the spark for me that it once did, though... but that's okay! I have Trisphee now, so I can start a new treasure trove!
Emperor of Japan*Anonymous Fiend
Nikko, Kaguya, and Toki are my siblings
Reyo has an art thread!
Click the adorable tentacle creature!
I like to have spares for selling. but I'm not as good at playing the market short-term. I just buy and buy and buy and someday I'll be able to sell old things for bucketloads of money. thing is, I will probably feel the need to hold on to them in case they inflate even more later, and never feel like selling. XD