Open legend, an open source rpg uses a wealth level system for equipment. It states that a sniper rifle requires wealth level 4. However, at the end of the same chapter it discusses how to price a weapon you design. Using the rifle I calculate a required wealth level of -1 (Weapons require a minimum of one) I can use their rules and make a better cheaper version of the weapon. Could anyone find some statement from the creator of the game or a solid line of reasoning why this would make sense to do?
The rules regarding equipment and wealth are available online.