With the purchase history people still not being able to buy until Friday I'd estimate about 6k by the close of business for ticket sales,not too shabby for a league cup 3rd round match.
£20 seems about right I suppose,if we can take 7k to Milton Keynes I don't see why this won't sell out,especially as ST holders can take 4 bluds with them, hopefully get to purchase history and I'll probably take my Fam as well.