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It’s all powers of 10.

1,000,000 Vests to be a minnow.
10,000,000 Vests to be a dolphin (currently 5042 Steem Power).
100,000,000 Vests to be an orca.
1,000,000,000 Vests to be a whale.

Waooo ... I'm a year and a half and I'm almost 1000 SP ...
I'll be dolphin in 5 years or so lol.