I'm a member on a lot of forums and have seen this as well. It's easy to get confused going from one to another.
On LGT.com, just like the ready-for-sale photo requirement, the pricing represents the sale so it protects buyers and sellers. Beyond that, it provides a price-point for other members selling same/similar items.
From our General For Sale rules found here
LISTING REQUIREMENTS - NO EXCEPTIONS
- Post items that are ready to sell
- Retain all original post information, e.g., listing information, photos, price(s), etc., if/when a part is Sold or is no longer available for sale
- Keep all transactional information in the thread, including offer for the part(s), and acceptance of the offer by the seller - Don't delete anything
- Identify member-buyer(s) and sold price in the thread
Hope that helps.