its set in your profile if certain item types are being sold. you wanna look for these lines and set them how you like Code: <SellGrey>True</SellGrey> <SellWhite>True</SellWhite> <SellGreen>False</SellGreen> <SellBlue>False</SellBlue>
If you're using Dungeonbuddy, there is a setting under the Bot Config menu called Maximum Item Vendor Quality. I believe; Poor = Grey Common = White Uncommon = Green Rare = Blue Epic = Purple Legendary = Orange Artifact = Don't think these even exist in-game Heirloom = Gold So if you want to keep all greens and blues, set it to Common.