When you purchase legendary crests, remember that you're not purchasing a roll of the dice like you purchase a FIFA Ultimate Team card pack, say. You are purchasing the chance to play with Diablo 4 Gold the dice, to get into the game engine and alter the drop rate (slightly) to your advantage. Gambling mechanics that are addictive are not isolated from the addictive gameplay mechanics, but rather tied directly to the combat system and loot drops within the game. Diablo is incredibly well-positioned to achieve this. As my colleague Maddy Myers pointed out, these games heavily focused on loot always had the feel of a slot machine and this is what Diablo Immortal's business strategy makes an actual.
Blizzard has been at pains to emphasize that Immortal's monetization is able to be ignored up to the point of the endgame that is the case, and claims that the vast majority gamers enjoy the game without having to spend anything, which is quite plausible. However, it's not true that the main enjoyment of Diablo is experiencing the story instead of trying to max out your character. It's also absurd to claim that these games have always been designed to create a hunger for hitting the power level of the players. People who have a tendency towards gambling addiction, to the addictive aspects of Diablo's Item gameor, more importantly even both -- the legendary crest system could be extremely harmful and can be very exploitative.
For those who don't, it simply makes Diablo IV Gold less enjoyable.