Guild wars Farming and Loot Scaling question

Hello! I still havent figured out one thing about Guild Wars and that is farming and loot scale system!? If I am about to join this game I would be really grateful if someone could fill me up with some explanation, so I dont slip on that scale and get completely lost, heh. Thank you in advance! Cheers!

Hi! Are you sure you want to join Guild Wars now because when loot scaling appeared in this game, now rare item drops are not being that expensive. Before you could trade them so easily and make good deal during selling. Gamers that were in this game from the start are now complaining about new system. Everything is now insanely cheap, green, white gold are not being the favorite colors to farm for most of the gamers here, heh.