Members are always going to look for shortcuts and it will be time consuming for senior members to find the abusers. I do not understand that why the admin simple closes new registrations here or makes it paid or so. Members generally interested in discussions will anyway be ready to pay for this privilege. The members who do not want to invest any money for this can read the threads here without registering also. Currently, you are first inviting spammers, let them do spam and then spending time to ban them.
That would be seen as a greedy move. This forum was made to be a place for free discussion and for people to learn about cryptocurrencies. If people started seeing that they have to pay to be able to ask a question on a forum they would get discouraged. I guess i'm not ready for discussion because I wouldn't pay for registration. I'd move to free forums like reddit. Nobody is inviting spammers here. They are coming of their own will!