Why not offer ST holders other benefits - i.e free away shirt. This would help alleviate any concerns when reducing prices for one off games as ST holders have had some other non-price benefit.
At the end of the day, its just not good value for money at Saints. For most of this season we have been playing the youth team, but charging first team ticket prices. The club need to realise how price-elastic football tickets are. The Forest game shows that. It had nothing to do with Man U tickets.
In terms of overall revenue I'd rather annual ticket sales were £9m with average gate of 26,000 than £9m with an average gate of 17-18,000.