I would keep it up, even if it's to let people know it exists. I'm always surprised that tools like this never take off. I remember "Third Voice" which let people share notes about a web page back in the early naughts. I thought it was amazing. I just found out about AnnoCPAN myself and was impressed. I'm glad to know it exists and someone went down this path. Sometimes contributions show others the way even if they don't become popular.