Yesterday, I got repcapped through a serial upvoter, and I fully expected the rep to be taken away again. What I dislike, however, is the fact that I got the rep deduction account for today, which leaves me with a big minus (and red bar) for today unless I amass atleast the same amount of rep through upvotes. When the serial upvoter "grants" you over 130 rep, this isn't easily possible if you're not willing to spend 5h answering questions just to get the red bar neutralized.

As you can see, I really don't have to worry about the rep itself, but it does look quite bad and also doesn't make sense to me that I should be punished because somebody else had gone on a voting spree. I'd rather have the rep deducted from the 225 (however it got to that number...) rep of the day the voting happened.

As you can see from the graph, there are quite some days were I'm rather inactive in answering questions and just hang out in the Lounge, and a serial voting reversal would just be bad on one of those days. Note that the same happened to another one of the Loungers yesterday:
@LuchianGrigore You're lucky. I got a big fat red bar on my graph because of it (It was -113, and I only collected 55, totalling -58).
So, bottom line, can we please have the rep removed on the same day (if not technically, atleast data-wise)?