Perhaps shouldn't make assumptions when being so critical, it makes assertive views in how to resolve have less substance.
SeatUnique was sold out for the below. My
guess is a package wasn't ready, or a company booked them and didn't issue the tickets to staff/clients. Or, Everton didn't allocate them properly to partners;
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Everton allocate tickets. So games like Mansfield, SeatUnique sold out 3 times as they kept getting more and more allocation. The game then had lots of empty seats, because IMO, Everton made it almost impossible to pass on tickets etc.
Either way, we're all guessing but any empty seats in the stadium is on Everton.