I think you missed the point of the thread. Although his prices are insanely ridiculous, I was drawing attention to the sellers request that nobody "watch" his items if they are not interested in purchasing. In case you didn't know, people commonly watch items they may not want to buy themselves, but have interest in knowing what the item sells for. I fail to see how watching an item is trolling the seller. If someone wants to make a down to earth offer, I don't see how that would be trolling either.
If someone does not want people using a feature on the platform they are selling on, they probably shouldn't use that platform.