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The issue with events such as quality coupons and enhancement coupons is that it is absurd how abusive they can become. Integrating events in vindictus that give "good" rewards with relative ease actually becomes detrimental to the servers [although it eventually does trickle down, a small portion of players initially end up gaining "free money"]. At various points in history, it has been more profitable to farm accounts for one day and accumulate millions simply by selling coupons [to wealthy individuals, who actually end up profiting 2-4x] versus farming for months.
A few players who I spoke to that were selling the coupons mentioned they have created 10+ accounts for the event.
On the 11th, I purchased 26 quality boosters, 15m each for a total of about 400m.
From there, I could take a few different routes. The most simplistic and least profitable method: Purchase 3* lvl 90 item armory on MP for ~5m, boost it to 4* Take into account 15m for quality coupon 20m investment Sell the 4* item for 30-35m. Profit 10-15m every time you purchase a coupon.
The most profitable route I discovered ends up to be ~300% profitable. For obvious reasons, i'll keep the method to myself. But just note, with the current system [a lack of ToS enforcing], it is highly profitable to create multiple accounts, and substantially more profitable to buy whatever they are selling.