Magic crystals are what you use to learn and upgrade spells. You have a lot, so I'm guessing you have been casting spells from scrolls for the most part (Maybe just a warrior?).
Wishing wells are random, sometimes you'll get items or Runes out of them, and not just money.
You will likely not use up all your magic crystals (Unless you try to learn pretty much every spell in the game) so it is a cheap cost to pay for some random lewt.
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