Character Trade Prices

I'm trying to sell some of my Lordaeron characters and the site seems to be choosing a coin price for me. When I replace the sites generated coin value (200+ coins for a level 80), the site reverts my change. Am I not allowed to sell level 80's for 30-50 coins?

The minimum price is based of the marketplace value, so people dont end up buying chars worth 100s of coins for 30. If you want to lower the price, you need to rmeove some items.