Rita - The threads go into the Daylilies of the Day Archive Forum after 7 days on the Daylily Forum. Members can continue to post to any of those threads at any time. You can still earn an acorn "once a year" for a performance evaluation post. Plants can perform differently each year depending on how many years it's been growing in your garden, the current growing conditions, and the climate of any given year. So those performance reviews can change from year to year. That is valuable information for others to know.
Also, if you go to the Plant Database to look up any of those cultivars that have been featured on the Daylily of the Day, you will see a small photo in the upper right with the link underneath it to it's Daylily of the Day thread. Anyone looking up a cultivar will be able to read further information written by members who own and grow the plant.
So when you want to know about a cultivar here on ATP, looking it up in the database can lead you to more information than what you would get probably anywhere else on the internet!