I have been around the Steemit platform for 33 days. When I first signed up they delegated 30 SP to me and at the time STEEM was headed for the $8 range. My 100% upvotes at that time were worth 0.02 STU, very exciting for someone new to the platform. A few days later the "new account bank" (@steem) ran out of tokens to loan to new accounts through delegation. Without any warning the code was changed for new account delegations through @steem and those delegation were cut in half to 15 SP on January 8, 2018.
I noticed shortly thereafter that my votes were not worth anything, and was very frustrated. I even blogged about it in hopes someone would come answer my questions about why my vote power decreased.
https://steemit.com/questions/@royaleagle/why-is-my-100-voting-power-worth-0-00

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I was new to the system, frustrated by lack of voice and vote power constantly asking myself:

How can anyone expect me to stay around and use this steemit if my votes aren't worth anything?

People were kind enough to drop a link to steemworld stats and explained the voting power percent meter. This was a great insight for me into my steem experience but still did not answer my question.

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So there I was with 100% vote power and a 0.00 vote... Very discouraged and ready to just leave steemit.

I log on a few days later and Bam my votes are worth 0.01 again. This up and down vote worth was very confusing to a newbie like myself.

Then I found the upvote calculator. I plugged in my 15 SP and this is what I got:

The first time I did this it said 0.01 but when I left and upvoted someone's post it did not raise the payout amount on steemit.com Why? The page says I am supposed to give a 0.01 upvote WHY WHY WHY???

Someone suggested I add some 0s to the end to find out what my vote value was truely worth.

So I added 2 0s at the end of the 15 so that I could see the rest of the decimal places to the right. When I did this I found that my 100% upvote at that time was worth 0.0056.

Why didn't the post value increase by 0.01 in rewards?

The system adds the vote values and rounds up or down.
So if the rewards are sitting at 0.018 they appear as if the total rewards are 0.02.
If we add 0.005 to the 0.018 it equals 0.023 which is rounded down to 0.02.
Now if someone else comes along and adds another 0.005 vote that total will be 0.028 which will get rounded to 0.03.

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Should I vote when my vote is 0.004?

Yes as long as your voting power percentage is above 90%.

Why should I vote for other people if my vote is 0.004?

1. Curation, if you like something before others you have a chance at getting curation rewards and yes they pay even on a 0.004 vote. You may be able to get back 0.003 or higher SP from curation if you are one of the first people to vote.

2. Your vote is added to the whole. If 5 accounts with 15 SP all vote a 0.004 vote the system adds them together and their cumulative effect is a 0.02 vote.

3. This vote valve fluctuates with the price of STEEM as STEEM prices go up your vote worth will increase. So you can vote something that may have a 0.00 vote today and it could go up to 0.01 later in the week if the price of STEEM rises.

In conclusion if your vote power is above 90% yes your vote is still worth something and you should vote!

If you have any questions or don't understand please leave comments below and I will try to help you.
Have a great day!