You can use WoT from other people, but you not being the center means you might not get posts from some of the people you follow.

This can be minimized by using several WoT relays, from several people, maximizing the chance you have all your friends covered. Bu still, the best solution is to use your own.

About one of them connected to a moron, you just need to block the moron on your client. The problem we try to solve is not morons, but spam. If the spammer makes into the Wot, you just block him. If he creates a new key/user, he will no longer be in the WoT.