I can't find any sensible reason not to buy Wizz Discount Club, but they must make money somehow. Do you know why do they have it at all?
I thought it auto-renews automatically next year, but no. Perhaps the discounts get much worse once you buy it, but the first return trip for 2 people with luggage already enough to pay for the membership + get some money back.
- The membership motivates people to travel with WizzAir more. They make money on other things during this travel.
- The membership enforces one to use their real account each time, so they can track better and perhaps optimize their prices higher.
But I have no confidence.