>having thieves steal their money if they got too rich
Money attracts that kind of thing, even in the real world. There's a reason rich people have guards. Also bodyguards - I was just listening to a podcast about how a fairly rich (and flashy) drug dealer got kidnapped and ransomed because he didn't think about what a target he was. Obviously more challenging when you're talking about heroes who are personally formidable, but think about friends, family members, retainers, etc.
Money attracts that kind of thing, even in the real world. There's a reason rich people have guards. Also bodyguards - I was just listening to a podcast about how a fairly rich (and flashy) drug dealer got kidnapped and ransomed because he didn't think about what a target he was. Obviously more challenging when you're talking about heroes who are personally formidable, but think about friends, family members, retainers, etc.