In the very earliest days the mining paid STEEM and you had to power it up to get SP/VESTS. Then at some point (I believe when the first witness election took place) it switched to mining paying SP/VESTS.
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Interesting...thanks for clarification...why is there any VESTS then if it anyway is just SP and vice versa and it has been like that since the very start of the Blockchain?
At the blockchain level there is only VESTS, not SP. The SP concept was introduced to make things easier to understand at the UI level. Opinions different on whether it actually succeeded.