#7 already done you never see a tradeable armor or weapon with 150+ Hp and Mana but 200-300 hp/mana items are common on raid equipped toons
#2 Cap on at least some trades is 500 there just isn't any thing you can make that will get you there. the probob with most trade skill items is those few that do this as a job to make plat for there boss to sell ruin the economy. example I have a buddie who spent a lot of time figuring the least expensive way to make a gate potion. his cost not counting time was 1284pp there is a couple of mules in the bazaar on our server that have 20-100 on them at all times and they sell for 1300pp that is 16pp profit for all your time. I can go farm plat and make more killing lv 8 goblins in BB