The Chatbox got a pretty cool update recently, but it definitely affects one of the main rules. My suggestion is regarding changing the rule about Sales.

With the old Chatbox, you were allowed to post your sale ad once within a full scroll. Depending on the activity within the channel, that was maybe once every 10 minutes (maybe 15-20 minutes, later in the evening when things slow down).

However, the Chatbox now scrolls for much further. Checking the timestamps, it seems to go for over a full hour (16:52:54 - 17:59:14 as I am currently looking at it) and with a quick CTRL+F it seems to hold 100 posts at a time within one scroll.

My suggestion:
a) Change the rule to posting your ad once every x minutes (15 or 20 perhaps)
b) Change the chatbox to hold less posts in one scroll (50 rather than 100 for example) as suggested here

Thanks!