900 hours on 1 character does not mean they are a chinese farmer or a bot.
The game's been out for about 8 months, if they only played 6 hours a day that would be about 1500 hours of play time.
There are many people with 2000+ hours.

Use the auction house if you don't like dealing with people in trade.

Block people that annoy you, and leave the game if you think someone is trying to scam you.

You don't need a Blizzard response for your petty, very standard issue.

if they are or not chineese farmers what i bring here is the chance for blizzard to track those 2 very suspicious dudes. maybe they can track theyr ip and figure it our if its the same of a chineese farming industry and if so ban theyr accounts?

why not what i bring here is just an oportunity that allows blizzard to fight back those outlaws.