Well, the justification I had for including 11 was based on the assumption that 9 resold for 11 within a day or two. However, I was incorrect. The sale for 11 was the first in the history, and the before it was of a different item.

Airdog also doesn't really support 11 as much as it supports 10 or lower:

https://pastebin.com/MGqvZSqL (note that the 10 sale is the powdered)

Stout does support 11 (sale ends up being 10.5 keys if used here, using there to set a lower end):

https://pastebin.com/ZaUMhJMQ (pretty sure there was another history with more sales, not sure where it went)

However, I don't think a sale at 10.5 is enough to justify 11, which, as you said, is nearly outdated. I doubt that a sale (not even being used here) is enough to counter the points you made. (near / is outdated, technically only sale that high)