How is Uminari one of the best places on Earth? And where and how are you going to get 30 motes of Blue?Uminari is one of the best places on Earth 97 and produces only 1 mote. Mana storage wastes about 50%, so we need to draw from 44*2 = 88 lands. That's, quite simply, not feasible, regardless of harvest.
The earrings, in contrast, offer 6 motes capacity. The trick is that we can planeswalk with them, unlike temporary storage constructs. We can harvest Blue mana on e.g. the Magi-plane, refilling the earrings several times.
44/6 - 1 = 6.3, which means recharging the earrings 7 times off-plane. Of course, it isn't quite so simple: We can only use the earrings directly once per summoning, so 5 times. The other 1 1/2 charges need to be dumped into storage, again at 50% efficiency.
Ultimately, we end up with a maximum of 8 harvest-trips.
Keep in mind this is a worst case, but regardless of the scenario the earrings are effectively worth 5*6 = 30 motes here due to their storage capacity being refilled off-plane once per summoning.
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