Of course, I was in the process of writing a post when I came across your post so I upvoted and resteemed instead.

From what I can see there are a total of 12 accounts that are being upvoted on the 6th day and every one of them makes a daily withdrawal to the same bittrex number. The accounts are:

@honeybee
@helgachen
@serenawu
@ashely056
@wisemansays
@twinkledrop
@amylee
@maysun
@allanlong
@sherrychan
@trendylife
@thecatfiles

It seems like she is farming upvotes from these accounts with her delegated steem power. Most of the accounts make 4-5 posts a week so lets do a little math and assume they all make 4 posts.

One 100% upvote = ~$300

$300 x 4(posts) = $1200 per week/account
$1200 x 12(accounts) = $14,400 per week

$14,400 x 0.75 = $10,800 after curation

$10,800 / 2 = 5,400SBD per week and 5,400 SP

SBD is currently worth $6.20 so 5,400 x 6.2 = $33,480USD being taken from the reward pool weekly.

Also, a bunch of these accounts are in the process of powering down so that SP is being converted to Steem and withdrawn as well. There is no rule against something like this but the fact that all the votes fall on the 6th day leads me to believe it is so they have no chance of hitting the Hot or Trending page and no one can see what she is doing.

All the numbers are rough averages and this is only my opinion, there may be another explanation and if anyone has a guess let me know.