Have the prices been the same for all Group games? (£20 for STs & Evertonia; £25 general). I know they had to release the tickets, and therefore set prices, before we knew it was a dead rubber. With that in mind £20 & £25 didn't seem too bad. obviously in hindsight it could have beena bit lower.
What could they practically do once situation changed? (not trying to defned - after suggestions) Many would have already bought, so refunds would be time consuming & costly.
I suppose one easy change would have been to bump the reward value for the fixture - a fairly straight forward step. Or announce a discount for the next Europa home game for people with ticket stub (maybe more tricky to implement - but they had time, if they had adviertised early)