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Even as a subscriber you won't get enough XP to keep up with the enemies doing only class quests. You'll eventually reach a point where you just can't touch the enemies and you'll be dying constantly. If you're not a sub (whether you're full F2P or preferred) you have a 25% XP reduction that kicks in at level 10, which puts you even farther behind.
"Im talking about 2 hits. I hit you, you hit the floor."- Keenan