Earlier quoted context omitted.
Scalpers don’t typically sell tickets for less than face value.
Nor is OP if you take their 20% discount into account. Scalping tickets designed to be heavily discounted for fans, then re-selling them to anyone for profit is scummy even if the price still comes under the non-fan price. At best you're just denying other fans the chance to get discounts for your own profit.
scalping tickets isn't morally distinct from any other form of "buy low, sell high."