Value (Piñata)
Each piñata has a value. If you check the Value tab on the information window, you can see an in depth overview of the piñata's value in several sub-categories. They are as follows:
Accessories value
This is increased by fitting the piñata with accessories, bought from the Paper Pets store. The higher the quantity and quality of accessories worn, the higher this value.
Age value
This value increases very, very slowly over time. However, this is the only value which does constantly and reliably increases, so if you are aiming for a high value piñata, keep the same one throughout to get the most out of this category.
Overjoyed value
The piñata gets a boost in value when overjoyed. So, if selling a high value piñata, or attempting to get into the highscore tables, it may be worth forcing an overjoy.
Sweets value
Not much is known about this category. It has been speculated that it would increase when consuming candy, particularly Life Candy, but nothing has been discovered so far.
Twin value
As of 5th of January, 2007, one birth of Twins has been documented.[1] GameFAQs user duckforcover bred Twin whirlms, apparently by doing nothing special. The egg induced a cutscene, from which two Whirlms were born, each with a Twin value of 50, giving them an overall base value of 150 (100 Whirlm base value + 50 Twin value). New owner of the whirlms, fellow wiki user LordRavenBlack, has said he will post a picture, and therefore give evidence, about this apparently random and rare phenomenon.
Base value
Each piñata has a base value. Rarer and higher level piñata have higher base values. Base values can be increased by sending the piñata to parties via Piñata Central.