A lot of people should never play Disgaea because it would destroy your lives.

I have bad habits with Final Fantasy Tactics. Every turn must result in JP and exp, and I often have my people sitting in a plus formation constantly buffing each other to milk more exp and JP while I slowly chip away at the monster horde. I'm always hilariously overleveled for story missions. Always.

I also do the hording items thing, though I've since been breaking myself of it and will use good items if necessary. Thing is, many games don't really require it because they aren't terribly difficult.