She just asked me for a 100k sp item and I don't know whether I should get it for her or not.

Up until what amount of sp should I spend on her quest? E.g. should I cancel any quests that are more than 50k sp? '

I don't like to gamble. Every time quinten asks for an item that's more than 25kt I cancel his quest because he usually only gives me 19k sp.

I'd skip that one. Oracle Quests are good for people with higher level battle pets although she can give out unwanted levels.

There are achievements for Oracle Quests but it's not worth spending a lot of sP unless you are desperate for these achievements.

that primarily depends on how desperate you are for pet stats. for me, training my battle pet takes upwards of 7 hours per session, so i find oracle quests quite valuable. but if you don't really care about training, there's not much benefit aside from the achievement.

Thank you very much, i hit the skip button ;w;

Quick side note about Quentin: they only ask for items up to ~50k I think and give out a decent amount of mage amulets. I don't know if that's the part you meant about not liking to gamble but even two amulets is likely to make up the cost of their quests for the day