The 20-star-per-chatroom-per-day limit appears to have disappeared.
Tested with 2 different chatrooms over on CodeReview. Got up to about 70 stars before coming here to write this report.
Whoops, yeah. The limit was temporarily lifted the day after the US election and we intended to put it back... and then evidently forgot.
I'm "putting that thing back where it came from" as we speak. Thanks for the report!