It only takes 5 minutes and I often give them the link to register, it isn't that hard because kids have managed to do it. Most people are used to just joining a server then teleporting into the wilds so registering is too much for them and they leave, which doesn't really matter because if they are too lazy to register most of the players that are like this are undesirable as they either steal because it's easier then gathering your own stuff, originally planned to grief the server but registering is too much effort or are too lazy to read the rules/information and end up getting banned and/or asking stupid questions about the tardis plugin in the chat. These kinds of players aren't wanted here and the registration process helps weed them out. Also if a guest cannot handle the website they probably aren't going to remember the rules either.