I think it depends on the site, enzo. On TalkBass, you'd be absolutely right. I haven't been around much lately, but this site always seemed more about friends trading items for fair value rather than a place to buy and sell for profit advantage. That being the case, if someone wants to sell an ordinary Spoiler for $4K, we don't want to see anyone who doesn't know better buy it and regret their mistake later or the seller sit frustrated while no one expresses interest. Usually, issues like that arise with people who aren't regular participants here, but rather someone who sees us as a target market and just drops in for a purchase or sale. In the case of a rare and highly sought item like a Series bass with graphite neck, it's hard to imagine any number that would be unattainable. There are so few that someone who wants one might be happy to pay significantly more than what the last one sold for. $8K is certainly a lot of money, but very hard to call it excessive.
In any case, there's a fine line there somewhere between being helpful to a seller who doesn't realize the value of the product, helpful to a buyer looking for a first Alembic without a full understanding of all the product names and options and their impact on market value, or just being rude.
Hopefully a mod can pare a few of these messages out of this thread into another since poor rockandrowe's thread is already cluttered with junk unrelated to his sale.
-bob