Ed_Laprade
Adventurer
Usually. We played a DC Heroes game (I thik it was) where someone decided to be a ex sniper and had a good rifle. Turns out it was the best 'power' in the group! (But that campain went down in flames for other reasons pretty quickly anyway.)One way to break out of the rut of the so-called "D&D mindset" is to play a superheroes campaign, especially one that is "4-Color"/"Golden Age"/"Silver Age" as opposed to "Iron Age" or "Noir."
The reason is that the superheroic campaign simply doesn't reward the "D&D mindset" for the most part. Most supers don't improve by buying new stuff or taking others' gear, they improve themselves.
For Call of Cthulu five gallon cans of gasoline with dynamite taped to them. If they don't stop the monster run away. And keep running until you're at least in the next state!

So the problem can creep into a game even if no one has any intention of allowing it to do so. It can be insidious, especially when your character's life is at stake.