>>528946390
You get iirc 278 crystals per day, 8340 per 30 days, assuming you will use up all 9 tears(without any additionals), that means you will be losing 660 crystals per month, which means to lose 15 crystals per each element you would need to upgrade 3 costumes for 22 months, we have 5 elements, so 110 months.
9 years of upgrading every month to lose all those crystals(without any freebie crystals and tears)