They average less than 6,000, but even given if they did have those crowds, its probably fair to assume that at least 2,000 are season ticket holders who have already paid their money, of whom I would have thought very few would be demanding a refund for a curtailed season. Not everyone of the remaining 4,000 will be paying full price either, so an average ticket price is probably nearer £15 for those 4,000 extras. So £15 x 4,000 x 5 matches = £300k. I think £2.50 a head on F&B is a fairly generous estimate, as I imagine the majority don't purchase anything, and lets say 1,000 cars paying £5 a pop, would all total about another 100k. All that is still nowhere near £1m.
The point of all this is, that it seems to me that their chairman is politicking in exactly the same way as Tranmere and Peterborough have been, for his own purposes, albeit with more subtlety. He seems to be exaggerating his revenue losses by doubling what is probably the true figure, in order to deflect some of the criticism his club have taken over their stance to vote against the continuation of the regular season while still wanting to be part of any play off scenario. I don't know why he's done it as a £500k revenue loss will still be recognised as a significant loss for a club like Wycombe, but exaggerating his potential losses weakens his credibility in my opinion.