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Not everyone who cannot be bothered aren't necessarily LQ, they can turn out to be smart users, but are just simply lazy..

It's not just laziness. If you're joining a forum with no knowledge of whether it's good or bad, then taking a test would just seem like a waste of time, lazy or not. It would certainly make many people who may be smart or talented not want to join.

If you really want to join the forum and contribute, a quick test on a list of rules (that is short) isn't that bad.