Question - after upgrading both my weapon and Eidolon inventory slots to 120 max slots I have another 3000+ jewels now. Is it worth spending the jewels on another 10 premium gacha or save them for buying Elixirs etc? Whats a good number of weapon and Eidolon slots to have?

Reason im asking is I remember someone saying a while back that the number of jewels you get is actually finite and the quests you get that give them eventually run out but I cant find that post anywhere now after searching alot for it.

Ty for the help.