All of those purchases are for visibility, and provide no rewards through upvotes in return. Money goes one way to gain visibility, not both ways, as on Steem. It's not the same, although there are similarities. As for "natural", anything that happens can be said to be "natural", which isn't an argument for why it should or shouldn't be there.
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Lolz. Everything is natural. Oil is a natural resource. Doesn't make it the best choice or end solution in many ways.