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Well, it can be. If you have a way to invest, even a small amount in steem, it's to your advantage. But, renting a delegation of SP is cheaper than buying it. It's only a short term solution, however. Once I got past 60 SP, I was able to put up seven posts with that account in a row today, as an experiment. (that series you were linked to) so, that's about $240 worth of steem. Let me know if you need any help with anything. I'm on the platform most days.