also consider the fact how much stress this would put on the servers. it's not somethint like amazon has, where you rate reviews because each product only gets a few reviews and plus, they have a system in place to handle an enormous load of connections.
so, if a thread has, on average, 40-50 replies, in addition to those server requests that handle new posts, edits or deletions, you'd add an extra request per each post that would get rated.
plus, i think majority people would just ignore the fact such an option even exists. so, you'd end up with a million posts with a note next to each of them saying "0 out of 0 people found this post useful."
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2011 E92 M3 - IB/Beige/Sycamore Wood/6MT/EDC/ZPP2/Nav/PDC/Heated Seats/iPod-USB/Enh. Audio
2008 E92 335i - Montego Blue/Black/Gray Poplar/6MT/ZPP/ZSP/Nav/PDC/Heated Seats/HDRadio/iPod-USB - Sold
2006 E90 330i - Mystic Blue/Black/Aluminum/6MT/ZPP/iDrive/PDC/Heated Seats/Sat. Prep - Sold
1994 E36 325i - Boston Green/Beige/Automatic/ZPP/Heated Seats/Premium Sound - Sold
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