people might also know what they are worth but dont choose to share because anyone should be able to form an evaluation of value by searching the internet and finding sales history, asking prices, etc. it takes time & money to do this research... so some are not willing to give that experience away for free.
another reason could be because as soon as some mention a value on here, others are quick to jump on them and say they are wrong, leaving many silent as result.
I think Bryce is spot on with this comment. One of the biggest reasons I have alack of participation on this site.
