Daily Challenges and minecoin rewards

So ive only spent a little bit of mine coins and paying money to buy in game mine coins just doesn't feel right. So what if in minecraft having a daily challenges that rewards you with mine coins depending on the difficulty. So like a dirt, wood, stone, iron, gold, diamond and netherite difficulty and how valuable each material is the harder. Dirt would give 10 mine coins. Wood would give 20 mine coins. Stone would give 30 mine coins. Iron would give 40 mine coins. Gold would give 50 mine coins. Diamond would be 75 mine coins. Netherite would be 100 mine coins.