doubt there will be many boosters… the ones that will be boosting will be charging insane amounts of gold. 2 Reasons for this.
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People will be leveling their characters to 70 instead of boosting other players.
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Gold making in OUTLAND will be MUCH easier than boosting people. Unless they are paying you thousands of gold. Questing and just playing TBC in general will net you more gold. TBC is where gold inflation started.