I spent about 500k buying corrupted jewels and now have a net loss of about 120 upgrades on my weapon. Mathematically, they are worthless, practically they are torture. A weapon that took me months to get to it’s current level is now +3. I think there should at least be more than a 50% chance of getting the luck of the draw.
Less logically, as a player, falling for this so hard and losing months of progress really makes it hard to want to continue playing this game.