For protection. PGP helps you encrypt your sensitive information (like your address), and escrow protects your funds until you have received & are happy with your order. FE = finalizing early = releasing the funds to your vendor before you've received the order ... this is something you should NOT do. Please take some time and read the SR wiki - it will help answer all of your questions: http://dkn255hz262ypmii.onion/wiki/index.php?title=Main_Page