This isn't about comparing deadlifts though, it's never been to see if my deadlift is better than yours...(I'm not saying that you're saying that). If someone wants to be an idiot about it and lie to themself, then I say let them, they aren't helping themself in any way - at all.
Nobody is trashing your deadlift like it's a comparison by simply typing an arbitrary number (if they, whoever they is, are in fact lying about their 1 RM/PR).
Individuals can keep their own list as well, see how they improve, and plug in their own stats to get a coefficient of their own without posting it up here if they don't feel comfortable doing it.