bwhahaha$60 perfectly competes with the Cost of the expansion + Account transfer, which was their goal. This is not a service they really want to sell
They could very easily put in a cooldown period restriction (cannot use boost to 90 feature again for 90 days) with a much lower price
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Furthermore they could make it so the people who had the idea to buy multiple copies of the expansion just to paid transfer their free 90 toon to another account not work. boosted 90 ineligible for transfer just like characters below level 10 and DKs below 60