I started my trading journey with cald when it first came out, I did not know values and accidentally traded it for something worth like 6k, but from there on I searched up values and at the moment my inventory is worth about 100k with my miju, aeries, and some other high value creatures like lorolael
No worries!! A lot of people look over how much demand effects the prices of things. The base price for all limited gacha creatures are 2.5k, but some like halaqual have so little demand that they're worth less than 1k. Seradae has very high demand due to it requiring 200 hours worth of time points, which drives up the price.