If it were worth $8 per month to someone else, but not to forgottenpass, that person could just pay forgottenpass $8 per month (or some lump sum equivalent). That this does not happen suggests one of the following possibilities:

1. The domain name is not worth $8/month to someone else

2. The domain name is worth $8/month to forgottenpass

3. The market for domain names is inefficient