Okay, this IS confusing, anyway if you look at the third and fourth column, it's the same as in my calculations above.
For the first trade, you give 10 BTC (third column) and get 187.673 USD (fourth column), which is 188.9 USD minus 1.227 USD fee.
For the second trade you get 4.968 BTC (third column), which is 5 BTC minus 0.032 BTC fee, and you give 92.555 USD (fourth column), which is 5 BTC times 18.511 (the original rate).
Anyway, you can just forget this last confusing part, since after the relaunch the history page was redone, and now shows trades and fees separately.
Thanks a lot for the explanation.
I was indeed confused because the former interface would indeed show up my fees on Asks and my fees plus the seller fees on Bids.
I'm glad to learn that it was just a confusing display.
Give Mark a break!
Look, I was only enquiring to get my bot settings right, not flaming anyone's name.
I'm sure Mark wouldn't mind admitting that the documentation is sparse and agreeing to a 3rd party explaining his computations on the public forum.
My bot is doing day trading anyway, so we're talking many low profit trades, and Mark will get the best of my gains at the end of the day.