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With 2.0% vote he got 1.40 USD. Let's not actually take into account he got also lucky to receive a random extra vote. So full vote is 3.5 USD. Which for ease of calculation lets say is 3 SDB. Though only 70 % goes to the author as rest goes to curators. So that's 2.1 SDB. And you get only half of it in SDB, rest in Steem. So even with full upvote you don't really get much out of it.

Now, is it worht a gamble? MEh. It used to be :).

Another thing to consider is that actually by the time 7 days will pass the post value tends to lower by 50 %. So those 3.5 USD actually become 1.75 USD by the time it's time for a payout.

I think its still worth it it helps attract others to your post.

I agree with it gives you initial boost.

Yep, it can be good to get into the "Hot" tab with your post.