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Given that a self vote with 100 SP generates you about $0.02, and you can manage 10 of those a day at that rate, You'd net yourself about $1.40 per week, split between SP and SBD. Converting 50% of that down to SBD would net you about 0.49 SBD + 0.70 SBD = $1.19 SBD.

The current rate of 1 SBD for 100 SP then is slightly less profitable, in numbers, than just posting and self voting. By a mere 0.19 SBD. However.... also factor in the time taken to make those posts, upvote those posts, make the conversion happen after the 7 days (for each) has expired, etc.... suddenly $0.19 to just set it and forget it seems worthwhile (in my opinion).

Not to mention it's much less spammy than making a bunch of quick posts just for the sake of upvoting them, which increases your reputation to readers by some extent... and it's helping out minnows trying to get a foothold.

Edit: It's early and I'm an idiot... it pays in STEEM, not SBD... so it's actually worth more to do the investment than it is to do the self posting on most days, depending on the value of STEEM.

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