There should be a system in place to mark against users who have this habit, with a case to be reviewed by Staff so not as to abuse the process, because otherwise there is no governing the unreliable sorts who drift aimlessly from topic to topic apparently searching for something they will never find, only to say, "Something in my life happened." when pressured about it. Consider me skeptical and cynical, but whenever I hear some new tragedy a player puts forth, there's that strong presence of doubt I feel resisting it. Now, mind you, I do not pressure them about it, but it does prove irritating.

Such a blacklisting system would only be visible to the topic's owner. The sort of, "This user has a negative rating for reliability." or "This user has a high negative rating for reliability." versus the, "This user has a normal rating for reliability." It isn't impolite or wrong to tell a Game Master that sort of information. If you, not saying that you are but in a hypothetical, were someone with a highly negative rating, it would and [i]should[/i] be your duty to convince me as a Game Master you're worth inviting. You're unreliable and prone to disappearing in such a circumstance, so make your case why this is suddenly different and that you are not outright wasting my time or that of my other players.

If people cannot accept that as reality, that they are subject to review and should be and that not everyone should have to suffer for their lack of participation, that same which strongly negatively impacts others, then perhaps they shouldn't be on the Guild.