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I do not think that this view is right. Because the value of the votes goes down as well, your totally reward will not be 10 Dollar anymore but maybe only 6 Dollar.

But i must admit, that I have not fully understood how this is calculated exactly....

Yeah, I guess he's right if he's betting the price will rise again soon. When I started, SBD was about 3x Steem. Now they're about equal. Still, you get more from the SBD half of the rewards because the Steem is calculated as the USD value of it. If SBD was actually worth $1 USD, it would be different. Right now, it's sort of depressing as I watch my rewards drop on all the posts that haven't paid out yet just because of the changing values/ratios.

It's purely based on steem price averaged over the last 3.5 days. You are right.

I guess you could look at it that way. If you get $1.00 USD worth of Steem, you'd get more when the Steem value is lower.

No this is incorrect. The value of your post to begin with is in terms of steem. The value displayed in the UI multiplies by the steem price because the blockchain thinks 1 SBD is worth 1 USD.
In the post I point you to where the actual estimate is computed, and you can see starting from where it takes a fraction of the reward pot.

Thus, as steem price fluctuates, so does that number in the UI. Which by the way, is not immediate-- it averages the price in the last 3.5 days.

Thanks for this clarification. I was just assuming that the OP was looking at it in a "glass half full" vs "half empty" sort of way. :) I'm impressed by your understanding!