you do realise that the club gets 5% commission on any/all away tickets it sells don't you?
Best avoid them all then
However, there are some where a statement needs to be explicitly made. Even better to show our awareness, would be to substitute AFC Wimbledon for MK Dons that particular day.
Substituting a club for Gillingham is harder, as Charlton would be the obvious one... until they started running free coaches from Kent! Maidstone Utd would be a good substitute however, a club that lost its ground, backed a gamble on planning permission that never came... the symbolic pathos of going to Maidstone instead of Gillingham would be apt.