Interesting!

Cleyg then began to tell them what he knew. "It seems like there are really many different ways to get Existence Pearls. It's just that these ways can't be repeated. I heard that a guy accepted to do a job for some store merchant and got paid with an Existence Pearl. However, when he tried to repeat the same job, the owner of the store only paid with gold coins. Other people thought that it might be because a person could only get a single pearl from the same job and tried to do it as well. Unfortunately, everyone who came after the original guy only got gold coins as well."

Venali narrowed his eyes after hearing that. "That means the number of Existence Pearls is limited. Very well, did you get the pearl of that guy?"